Using "that" excessively in sentences
Solution 1:
I've found, when a word presents a problem, that it is often helpful to re-order the sentence and avoid the word altogether.
So you might try something like: "From what I have presented thus far, Hume's argument should be clear: reason has no role in moral determinations, and the sentiments from which moral determinations are drawn are those universal, intrinsic aspects of human nature."
Or do you think have I changed your meaning/emphasis here?