Many plants survived the eruption of Mt. St. Helens, and their presence brought deer back to the area. What type of sentence is this? compound-complex compound complex simple

The sentence above is a compound sentence.

Explanation:

A compound sentence joins two or more independent clauses with a coordinator such as and, for, but, or a semicolon. Independent clauses can stand alone as a sentence because they represent a complete thought. The sentence above is made up of two independent clauses linked by the coordinator and (1,2).

1) Many plants survived the eruption of Mt. St. Helens

2) Their presence brought deer back to the area

It is a compound complex sentence where there are two phrases used together and there is one dependant. For example, because my pizza was too cold i heated it in the microwave. There the sentence given here is an example of compound complex sentence.

More such examples are, i waited for too long but then i decided to go alone. In compound complex sentences there is a dependant on which the sentence is based. The two phrases are linked together with that dependant.