Is rocket the simple subject for the following sentence. The Saturn rocket made travel to the moon possible.

Yes.

What is the simple predicate of the following sentence?

The Saturn rocket made travel to the moon possible.

Yes, "rocket" is the simple subject in the following sentence: "The Saturn rocket made travel to the moon possible."

To identify the simple subject in a sentence, you can follow these steps:

1. Identify the main verb: In this sentence, the main verb is "made."

2. Ask "who" or "what" performed the action of the verb: In this case, "rocket" is the subject that "made" the action.

3. Ignore any modifiers or additional words: In this sentence, "Saturn" is an adjective describing the type of rocket, but "rocket" itself is the main subject.

Therefore, "rocket" is the simple subject of the sentence.