Answer: Dependent clause or subordinate clause
Explanation: This is an example of a dependent clause. A clause is just a group of words and it has a subject doing a verb.
This clause does not express a complete thought and it doesn't make any sense on its own which means
it can not stand alone as a sentence.
This sentence is not complete because it is not giving us the full idea of what it is trying to say. This means that it's a subordinate clause.
Dependent clauses and subordinate clauses are the exact same thing. They are just two different ways of saying this.