Two or more independent complex clauses may be joined to make a compound complex sentence.
In that case, the sentence is called a compound complex sentence.
A compound sentence in which one or more of the cordinate clauses are complex is called a compound complex sentence.
A sentence that contains at least two independent clauses and at least one dependent clause: “Queen Elizabeth I was called a redhead (independent clause), but no one knew her hair color for sure (independent clause) because she always wore a wig (dependent clause).” “Because she always wore a wig” is a dependent clause starting with the subordinating conjunction (see subordination) because. (Compare complex sentence, compound sentence, and simple sentence.)