Complex sentence: X's powerful supplier, Jimmy Price (Kenneth Cranham) sends him to track down Charlie, the teenage daughter of Price's associate, Eddie Temple (Michael Gambon), who has fled a rehabilitation centre with her drug-addicted boyfriend.
Split into simpler sentences: X's powerful supplier, Jimmy Price (Kenneth Cranham) sends him to track down Charlie, the teenage daughter of Price's associate, Eddie Temple (Michael Gambon). Charlie has fled a rehabilitation centre with her drug-addicted boyfriend.