Complex sentence: Actress Debbie Bartlett served as the show's hostess for the first half of the season, then left the series in early 1985 to join the cast of "The Love Boat" and was replaced by Susie Carr.
Split into simpler sentences: Actress Debbie Bartlett served as the show's hostess for most of the season. Bartlett left the series sometime before March 1985 to join the cast of "The Love Boat" and she was replaced by Susie Carr.