A simple sentence contains a subject and a verb and expresses a complete thought. It has no dependent clauses.

A compound sentence consists of two or more independent clauses joined by a coordinating conjunction (for, and, nor, but, or, yet, so).

A complex sentence contains one independent clause and at least one dependent clause, often introduced by a subordinating conjunction.

A dependent clause is a group of words that has a subject and a verb but does not express a complete thought and cannot stand alone.

A subordinating conjunction is a word that introduces a dependent clause and shows the relationship between the dependent clause and the independent clause (e.g., because, although, since).

A coordinating conjunction connects words, phrases, or independent clauses of equal importance in a sentence.

Compound sentence.