Complex sentence: This was the first time the song was perfomed on a local stage, the audience of 2,000 is stunned that a black man would dare to fling the charge of "murderer" at the "copper bosses" on their own turf.
Split into simpler sentences: This was the first time the song was performed on a local stage. The audience of 2,000 was stunned that a black man would dare to fling the charge of "murderer" at the "copper bosses" on their own turf.