Simplify the following text for a Grade 9 native English-speaking person.
Original: He met Fats Waller , who was playing organ at the Lincoln Theater accompanying silent movies , and Waller taught him how to play that instrument ( Basie later played organ at the Eblon Theater in Kansas City ) .
Simplified: He met Fats Waller , who was playing organ at the Lincoln Theater , accompanying silent movies , and Waller taught him how to play the organ .