Simplify the following text for a Grade 7 native English-speaking person.
Original: In 1946 , fifty years after the opera 's premiere , Toscanini conducted a performance of it on radio with the NBC Symphony Orchestra . This performance was eventually released on records and on Compact Disc .
Simplified: Fifty years later , in 1946 , Toscanini conducted a performance of it on U.S. radio , and this performance was put on to records and later on to compact disc .