Simplify the following text for a Grade 11 native English-speaking person.
Original: QuikTrip ( abbreviated QT ) is a Tulsa-based chain of convenience stores mainly found in the Midwestern and Southern United States ( not to be confused with Kwik Trip convenience stores ) .
Simplified: QuikTrip ( abbreviated QT ) is a Tulsa-based chain of convenience stores primarily found in the Midwestern and Southern United States .