Complex sentence: The 101ers were a pub rock band from the 1970s playing mostly in a rockabilly style, notable as being the band that Joe Strummer left to join The Clash and indeed Joe took many elements of the 101ers with him into the new band.
Split into simpler sentences: The 101ers were a pub rock band from the 1970s playing mostly in a rockabilly style, notable as being the band that Joe Strummer left to join The Clash. Indeed Joe took many elements of the 101ers with him into the new band.