Most papers end with a Summary or Conclusions section. Organization of the paper is important for clarity. Be clear, concise and complete. A good paper is not written in a day. Review each draft with the specific intention of eliminating unnecessary words, phrases and even paragraphs.
Active voice is usually preferable to passive voice, and uses fewer words.
Strive for accuracy. Base conclusions only on facts, not on conceptions or assumptions. Readers may not agree with your conclusions, but that should not be because they did not understand what you were trying to tell them. Ask others to read your drafts for clarity and completeness. Get to the point quickly, and stick to it.