1. After Momaday's book came works by other modern American Indian writers.

What is the subject?

book

No, "book" is in a prepositional phrase, so it can't be the subject.

The verb is "came." What came?

works

Right. Works is the subject.

In the future, I suggest you start by putting parentheses around the prepositional phrases.

(After Momaday's book) came works (by other modern American Indian writers.)

This makes finding the subject and verb easy.

The subject of the sentence is "book." The sentence is referring to Momaday's book and how it was followed by works from other modern American Indian writers. The subject is the main topic or noun of the sentence, and in this case, it is "book."