Complex sentence: In the original televised audition stage of the show, contestants sang in an audition room in front of just the judges, but from series 6 onwards, auditionees sing on a stage in front of the judges and a live audience.
Split into simpler sentences: In the original televised audition stage of the show, contestants sang in an audition room in front of just the judges. From series 6 onwards, auditionees sing on a stage in front of the judges and a live audience.