Complex sentence: It had celebrity guests, interviews, performances, games and'built in' CBBC shows and cartoons.It had a very different feel with Fearne, Reggie and DJ Devstar however once they left the shows style changed and was aimed at the younger end of CBBC audience.
Split into simpler sentences: It had celebrity guests, interviews, performances, games and'built in' CBBC shows and cartoons. However, once they left the show's style changed and was aimed at the younger end of the CBBC audience.