Simplify the following text for a Grade 11 native English-speaking person.
Original: Antonio `` Tony '' Ramiro Romo ( born April 22 , 1980 in San Diego , California ) is an American football quarterback who plays for the Dallas Cowboys of the National Football League .
Simplified: Antonio Ramiro `` Tony '' Romo ( born April 21 , 1980 ) is a professional American football quarterback for the Dallas Cowboys .