Complex sentence: Meanwhile, Val started developing feelings for her old high school fling, named Todd, the plumber (played by Luke Perry, who was one of Jennie Garth's co-stars on "Beverly Hills 90210").
Split into simpler sentences: Meanwhile, Val started developing feelings for her old high school fling. Which was Todd, the plumber (played by Luke Perry, who was one of Jennie Garth's co-stars on "Beverly Hills 90210").