Complex sentence: Patty Bouvier (voiced by Julie Kavner) is one of Marge's two cynical chain-smoking sisters (the other is Selma), who works at the Department of Motor Vehicles (DMV) and has a strong dislike for Homer.
Split into simpler sentences: Patty Bouvier (voiced by Julie Kavner) is one of Marge's two cynical chain-smoking sisters (the other is Selma). She works at the Department of Motor Vehicles (DMV) and has a strong dislike for Homer.