Asentence that contains one independent clause and one or more dependent clauses is a
simple sentence
complex sentence
compound sentence
fragment

Complex sentence.

Explanation:

Complex sentence comprises of the adjoining of two clauses where the one being independent and the other would be the dependent clause. A simple sentence comprises a single sentence while a compound sentence consists of two independent clauses and fragment is a group of words. Thus, the definition exemplifies the characteristics of complex sentences. Some examples could be as follows:

1. Before I reached the place, she had left it.

2. As soon as he realized his mistake, he ran to apologize.