Simplify the following text for a Grade 9 native English-speaking person.
Original: Carly Rae Patterson ( born February 4 , 1988 in Baton Rouge , Louisiana ) used to be an American gymnast ( the 2004 Olympic All-Around Champion ) .
Simplified: Carly Rae Patterson ( born February 4 , 1988 in Baton Rouge , Louisiana ) is an American singer and former gymnast . She is the 2004 Olympic All-Around Champion and a member of the USA Gymnastics Hall of Fame .