Generally speaking, writing scientific papers, as you have rightly observed, is not an easy task. However, by following the related details concerning the steps involved in the writing process and by motivated practice, we can always learn the ins and outs required for writing quality papers. First and foremost, you need to know the exact sections making a scientific paper such as the title, abstract, introduction, methodology, results, discussion etc. It is important to know that each section may contain several sub-sections and they are all founded on specific rhetorical organizations serving as the skeleton upon which the writer puts the words and structures. Second, to use the right words and structures, we can use the information provided by www. academic phrasebank.com. This sight provides you with acceptable structures for writing the paper. For more information, I refer you to the following links, which can hopefully satisfy your intended purpose.
Indeed, I put a bibliography of articles on writing in answer to the question mentionned above.
All I can add is do think of your readers.
Keep your sentence short and simple.
I am not sure what your mother tongue is, but I do know that in English, long complex sentences are not considered to be good sentences.
And, as I was told long ago in a writing class, if someone you ask to proofread your paper, do not give that person an explanation,: just rewrite the passage, even if you think it was perfectly clear. You know so much more about your topic than some of your readers, think of explaining what is obvious for you.
An old book, but with a fairly sound content, easy to read, ideal for an overview: https://www.amazon.com/Understanding-using-English-Newman-Genevieve/dp/B0007EG9H2
Writing scientific papers is not an event it is a process. I reached a acceptable writing level without reading any literature on how to write a scientific paper .Firstly, read scientific material in your area of interest, study them, because there is a tendency of differences in approach in different disciplines on presentation. The more you read you tend to grasp the style and you can start slowly applying it.
Attached are few excellent website links that give you some useful ideas and suggestion that could improve your scientific writing skills in English language....
"Writing scientific articles like a native English speaker: top ten tips for Portuguese speakers
Can you identify a single colleague who has not had a manuscript returned with the comment “needs to be reviewed by a native English speaker”? Many researchers receive this response even after translation or revision by an official translator or a native English-speaking coauthor. Over the past four years, while conducting my doctoral, and now my postdoctoral, work here in Brazil, I have been asked to both translate and help revise numerous manuscripts for my fellow Brazilian researchers. However, despite being a native English speaker and a researcher, I have found these tasks to be quite stressful at times. The truth is, just like it is one thing to write in Portuguese and another to write well in Portuguese, the same applies to writing well in English. Furthermore, not every native English speaker who writes well in English can write well for the scientific literature. Scientific English writing has its own style and rhythm, such as the use of passive voice. Passive voice is considered poor English in most forms of writing (news, novels, blogs, etc.) outside of science. The most recent version of Microsoft Office Word will even highlight passive voice as poor grammar and ask you if you want to rephrase. However, the use of passive voice is acceptable and even encouraged in some scientific writing."......
Please, goto the website link and read the interesting and the useful tips that would improve your scientific writing skills in English language......
English is a very rich language & improvement in scientific language may not be that much inconvenience as we think .It is a suggestion rather uncalled for but with our friends & colleagues who are associated with us in a line of program , we should talk with them in English language.
TV News channel in technical talks including media discussion also play an important part in understanding their style & method of talk . I also believe that practice of reading magazines & other interesting journals may certainly help us to appreciate the method of presentation of Publication. Besides we have to make a practice to prefer dictionary of science whenever we need it .
I believe that the key to improve your scientific writing is through reading in scientific books as this will enrich you with a considerable number of related vocabulary that are needed for scientific writing.