I have one independent clause with a subject and a verb.
simple sentence
Before you eat breakfast, please put away the dishes.
complex
I contain two independent clauses joined by a coordinating conjunction.
compound sentence
The car and the motorcycle were driving too fast on the highway.
simple
I contain two independent clauses joined by a coordinating conjunction.
When the kids first woke up, they brushed their teeth, and they dressed for school.
compound-complex
I contain one independent clause and one dependent clause.
complex sentence
Indifference can cause a huge fight.
simple
I express a complete thought.
a sentence
Everyone in the classroom enjoyed the game even though a winner was not declared.
complex