Complex sentence: There was speculation that the show has not proved as successful as its predecessor and that it may not return for a second season, however, a second series began in Autumn 2005, however, one of the former presenters, Sheena Keane, did not return.
Split into simpler sentences: There was speculation that the show has not proved as successful as its predecessor and that it may not return for a second season. However, a second series began in Autumn 2005, albeit that one of the former presenters, Sheena Keane, did not return.