Complex sentence: The two bands prior to the feud were known to tour together however things turned ugly between the two in 1989 when Kiedis accused Patton of imitating his style on stage and in their music video for their biggest hit "Epic".
Split into simpler sentences: The two bands prior to the feud were known to tour together. However things turned ugly between the two in 1989 when Kiedis accused Patton of imitating his style on stage and in their music video for their biggest hit "Epic".