Complex sentence: The beginning scene of the episode, in which Marge, Lisa, and Bart watch a home video, is a parody of the television series "The Wonder Years"; music from that series is also used in the background of the opening scene.
Split into simpler sentences: The beginning scene of the episode where Marge, Lisa, and Bart watch a home video is a parody of the television series "The Wonder Years". Music from that series is also used in the background of the opening scene.