Complex sentence: A year later they won the Division Two championship and survived the first season in Division One; however, Ternent left Gigg Lane at the end of the 1997-98 season to take charge of Burnley in Division Two.
Split into simpler sentences: A year later they won the Division Two championship and survived the fitrst season in Division One. But Ternent left Gigg Lane after the end of the 1997-98 season to take charge of Burnley in Division Two.