Variations of bowling have existed for centuries, but a standard form of the game wasn't established until various regional bowling clubs formed the American Bowling. What sentence is this
Complex
Simple
Compound
Compound complex

Complex

Explanation:

Complex sentence is a sentence that contains an independent clause and at least one dependent clause.

The independent clauses can stand alone and give a full thought while the dependent clause cannot give a complete thought.

From the answer, we discover that:

"Variations of bowling have existed for centuries" is an independent clause and makes a complete thought while

"...but a standard form of the game wasn't  established until various regional bowling clubs formed the American Bowling." is the dependent clause which gives an incomplete thought.

The above answer is correct.

ismene wants to follow the rules, unlike antigone who'd rather break them for her brother.