Simplify the following text for a Grade 6 native English-speaking person.
Original: On March 24 , 1975 , Stallone saw the Muhammad Aliâ `` Chuck Wepner fight , which inspired the foundation idea of Rocky .
Simplified: On March 24 , 1975 , he saw the Muhammed Aliâ `` Chuck Wepner fight which gave him the idea for Rocky .