We can take a simple sentence (independent clause) and tack on a dependent clause to the front or back end of it. This creates a COMPLEX SENTENCE.
Simple sentence: I ate an entire gallon of ice cream.
Dependent clause: Although my parents said not to eat so much
Although my parents said not to eat so much, I ate an entire gallon of ice cream.
Notice that the clause is separated from the simple sentence by a comma.
ONLY complex sentences can start with “Because”.
A complex sentence can be any of the four kinds of sentences.
Rule of Thumb: COMPLEX SENTENCE
This is a clause and a sentence together. To make one, write a sentence, then add a “Clause Maker” to the front of it; then write a second, separate sentence. Join the two pieces together with a comma.
I went to Community Day. It was a lot of fun. --- two simple sentences
When I went to Community day --- clause
It was a lot of fun. --- simple sentence
When I went to Community Day, it was a lot of fun. --- complex sentence
I like to play video games. I have a lot of games. --- two simple sentences
Since I like to play video games, I have a lot of games. --- complex sentence