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.