Simplify the following text for a Grade 10 native English-speaking person.
Original: Peyton Williams Manning ( born March 24 , 1976 ) is an American football quarterback for the Indianapolis Colts of the National Football League ( NFL ) .
Simplified: Peyton Williams Manning ( born March 24 , 1976 ) is an American football quarterback who plays for the Indianapolis Colts , a team in the National Football League .