Academic and scientific writing involves a specific skill set because it requires ideas and arguments to be communicated in a very formal, precise and structured manner. It is important for writers to have genre specific and audience specific knowledge. Furthermore, the use of appropriate tone for the field and usage of disciple specific vocabulary is crucial. In particular, non-native English speakers find it difficult to craft the language such a way that it is acceptable to the target audience. These skills are hard to acquire and may require years of writing articles and journals before one can perfect the writing.
Have a look at REF-N-WRITE scientific paper writing tool. This tool allows you to import text from previous papers relevant to the subject area in MS word. While you are writing your paper, you can just search for similar statements from other authors and inherit their vocabulary and language to improve your paper. It also comes with a library of academic phrases that you can readily use to polish your paper. Here is the link for the site.