Complex sentence: Five Star were booked to perform a gig at the UK holiday resort Butlins in October 2006, in which all five members were billed though three impersonators were used to mime to backing tapes.
Split into simpler sentences: Five Star were booked to perform a gig at Butlins in October 2006, in which all five members were billed. However, three impersonators were used to mime to backing tapes.