Answer:
A complex sentence
Explanation:
A complex sentence is a type of sentence made up of one independent clause (one that expresses a complete thought) and at least one dependent clause (one that can not stand alone as a sentence because it does not express a complete thought).
In this type of sentence, the dependent clause is often introduced by a coordinating conjunction such as <em>even though, when, after, while, because, since, if </em>and<em> until</em>. Here are some examples (independent clauses underlined):
<em><u>Stay here</u></em><em> until I come back</em>
<em>When Sara turned her homework, </em><em><u>she forgot to put her name on it.</u></em>
<em><u>I like him</u></em><em>, even though I don't enjoy being with his family.</em>