Identify the sentence structure. They sat and listened to the speech. simple compound complex compound-complex

In the sample sentence, "They sat and listened to the speech", this sentence is an example of a simple sentence. A simple sentence only consists of one independent clause. The subject is "they", and the predicate is "sat and listened to the speech". The word 'and' only indicates that there are two verbs used in the sentence and doesn't link two different clauses.