Compound-Complex Sentences

It's a complete sentence that makes a statement or asks a question.

Example: The dog barks.

It cannot act as a complete sentence because it beings with a subordinating word, such as when, because, if, whoever, etc.

Example: When the dog barks.

A compound sentence is made up of two independent clauses joined by a coordinating conjunction (for, and, nor, but, or, yet, or so) and a comma or by a semicolon alone.

Example: The pirate captain lost her treasure map, but she still found the buried treasure.

A complex sentence combines a dependent clause with an independent clause. When the dependent clause is placed before the independent clause, the two clauses are divided by a comma; otherwise, no punctuation is necessary.

Example: Because the soup was cold, I warmed it in the microwave.

A compound-complex sentence is comprised of at least two independent clauses and one or more dependent clause.

Example: Though Mitchell prefers watching romantic films, he rented the latest spy thriller, and he enjoyed it very much.

Example: Laura forgot her friend's birthday, so she sent her a card when she finally remembered.