Complex sentence: She returned for six guest appearances during the show's seventh and eighth seasons, including an episode that aired on January 17,1986 and was Plato's final appearance on the show, in which Kimberly suffers from the effects of bulimia.
Split into simpler sentences: She returned for six guest appearances during the show's seventh and eighth seasons. In the season 8 episode that aired on January 17,1986-Plato's final appearance on the show-Kimberly suffers from the effects of bulimia.