Answer:
This is called a Complex Sentence
Step-by-step explanation:
Complex sentences contain an independent clause and at least one dependent clause. An independent clause has the ability to stand alone as a sentence. It always makes a complete thought. A dependent clause cannot stand alone, even though it has a subject and a verb.
Example sentence: "I burned dinner, but not the cake."
We see how the first part of this sentence, "I burned dinner", can stand as an independent clause. It can stand as a complete sentence. Whereas the fragment, " but not the cake", is a dependent clause. It needs at least one other independent clause to make it a complete sentence.