Hi Demekin; Welcome to English Forums! If have more homework, and do it, I can understand the subjects better. Good!
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demekin"more"in this sentence is an adverb and it modifies "have".More is an adverb when it modifies another adverb:
AlpheccaStars More is an adverb when it modifies another adverb:I should do my homework more carefully. Or adjective:She is more beautiful than her sister.Or a comparative:I want to have homework more than my brother does.Thank you, AlpheccaStars.
demekin," I was aassigned to read 50 pages, but I read 20 pages more."More does not modify "read" in your sentence. It modifies "pages."