Complex sentence: She discovers that Wallace' daughter, Madeline (Maurine Powers) frequently goes to less than reputable nightclubs, and is also the pawn of Mr. Reynolds (Coit Albertson), who is dating her for business reasons.
Split into simpler sentences: She discovers that Wallace's own daughter, Madeline (Maurine Powers) is a frequenter of questionable nightclubs. On top of that, the girl is the pawn of Reynolds (Coit Albertson), who is romancing her for business reasons.