What is the simple predicate in the sentence - Life was not always easy for Japanese Americans.
A sentence is divided into the subject and the predicate. The subject is all of the words that make up who/what is doing the action in the sentence, and can be a single word or multiple words. The predicate is the action being performed, and can also be a single word or multiple word. HOWEVER, the simple predicate is just the action that is taking place, without any other words.
So, in you example question, the subject is "Life" and the complete predicate is "was not always easy for Japanese Americans." The simple predicate is just "was" though (was is the past-tense of the "to be" verb).
Does that help?