Complex sentence: Quinlan conspires with Grandi, and they arrange for Susie to be kidnapped by the gang, injected with drugs and taken to Grandi's other motel in town, where Quinlan strangles Grandi and frames Susie for the murder in order to discredit Vargas.
Split into simpler sentences: Quinlan conspires with Grandi; they arrange for Susie to be kidnapped by the gang, injected with drugs, and taken to Grandi's other motel in town. There, Quinlan strangles Grandi and frames Susie for the murder in order to discredit Vargas.