Eliezer has been telling me I should write more like he does

What are his reasons for suggesting this?

I often can't even tell what his posts are saying.

I agree. Personally, I prefer your writing style. Eliezer's writings strike me as being excessively long-winded and imprecise. As other commentators have pointed out, his Sequences generally have a very low information-to-words ratio -- most people, I suspect, would be significantly better off reading the primary sources instead of spending time reading the Sequences.