Here's why:
* Clause: A clause is a group of words containing a subject and a verb.
* Simple Sentence: A simple sentence contains one independent clause, meaning it can stand alone as a complete thought.
Example:
* The dog barked. (This is a simple sentence with one clause: "The dog barked.")
Contrast with a complex sentence:
* The dog barked because it was hungry. (This is a complex sentence with two clauses: "The dog barked" and "because it was hungry").