Complex sentence: To add to the plight of the underground bands, radio stations would not play their music due to the payola system in the radio industry despite the fact that most of these bands, if not all, had self-produced albums (indie).
Split into simpler sentences: To add to the plight of the underground bands, radio stations wouldnt play their music due to the payola system in the radio industry. This was true despite the fact that most of these bands, if not all, have self-produced albums (indie).