It depends on what your sentence if about. If it is introducing an argument, relate it to the q e.g. a paragraph to the question 'Discuss whether the Teleological Arg is convincing' may start as "The Teleological Argument is unconvincing because it relies on the questionable basis of flawed analogies."
Be firm and assertive in your sentences, don't say "some might argue" unless you are introducing a counter-argument. You are trying to persuade your examiner that your viewpoint is sound.
If you are introducing a scholar, be concise. There is no need for a background on their life e.g. "David Hume supports this,
convincingly criticising the use of analogy, in that one cannot apply human terms to God; doing so involves the risk of anthropomorphism". There is no need to say where he studied, what books he wrote etc.
One lifesaver, to ensure you get those evaluation marks, are adverbs such as "persuasively", "unpersuasively", "strongly", "weakly"; apply these when you introduce a scholarly view and you'll get the strong justifications you need