What is the simple subject in this sentence? The Saturn Rocket made travel to the moon possible.
The simple subject of a sentence is the subject of the sentence without any modifiers or other descriptions attached.
In our question, Saturn Rocket is the simple subject.
Why is it not simply "rocket"? In this case, we're dealing with a proper noun, which identifies a specific noun. "Saturn" in this case is not acting as an adjective but rather is part of the proper noun.