Simplify the following text for a Grade 9 native English-speaking person.
Original: UA is the senior and the largest in terms of enrollment of the state 's major research universities , the others being rival Auburn University and fellow UA System institutions the University of Alabama in Huntsville ( UAH ) and the University of Alabama at Birmingham ( UAB ) .
Simplified: UA is one of the three largest universities in Alabama . Auburn University and University of Alabama at Birmingham are the other two main schools in Alabama .