Sentence structure:
While your goal is not to impress your audience, academic writing is certainly more involved and requires a higher level of sophistication compared to high school writing. You are, therefore, expected to vary your sentence forms, using complex and compound sentence structures.  Transitions help you establish relationships between ideas and paragraphs and improve the overall quality of your writing. The most common transitions are conjunctive adverbs such as “moreover, therefore, consequently…etc” and transitional phrases like “ in addition, in contrast…etc)

Content:

Consider your readers’ familiarity with the content of your writing.  Assess your readers’ background knowledge of the topic and their ability to understand implications and references.  In general, the less your audience knows about your topic, the more details you must present to ensure clarity.https://academicplagiarism.com/resources/students/academic-writing-purpose-and-audience/