Complex sentence: Castle's gimmick is that of a flamboyant showman with an androgynous personality, drawing comparisons to Gorgeous George, Adrian Street, and Ric Flair; however, unlike those predecessors who have tended to portray villains, Castle typically plays a fan favorite.
Split into simpler sentences: Castle's gimmick is that of a flamboyant showman, with somewhat of an androgynous personality. It has drawn comparisons to Gorgeous George and Adrian Street; unlike those two, Castle typically plays a fan favorite.