Complex sentence: It hit the big time through Peer's introducing Central American music to the world and in 1940 there came another watershed when a dispute between the ASCAP and US radio stations led to the inauguration of the rival Broadcast Music Incorporated (BMI).
Split into simpler sentences: It hit the big time through Peer's introducing Central American music to the world. In 1940 there came another watershed when a dispute between the ASCAP and US radio stations led to the inauguration of the rival Broadcast Music Incorporated (BMI).