Complex sentence: It is through this relationship in which she meets the dogcatcher's nephew, a troubled, foul-mouthed, orphaned juvenile delinquent, Wesley (Jonathan Taylor Thomas), currently serving time in juvenile detention for a recent car theft.
Split into simpler sentences: It is through this relationship in which she meets the dogcatcher's nephew. This young orphan is a troubled, foul-mouthed delinquent currently serving time in juvenile detention for a recent car theft.