Simplify the following text for a Grade 9 native English-speaking person.
Original: An alligator is a crocodilian in the genus Alligator of the family Alligatoridae . There are two extant alligator species : the American alligator ( Alligator mississippiensis ) and the Chinese alligator ( Alligator sinensis ) .
Simplified: The genus Alligator has two living species , the American Alligator and the Chinese Alligator .