Complex sentence: A sheriff's deputy is assigned to investigate the complaint and Perry accompanies him to Foley's house, where Perry questions why Foley is building an addition to his garage for another car if his chauffeur has quit.
Split into simpler sentences: A sheriff's deputy is assigned to investigate the complaint. He and Perry accompany Foley back to his house, where Perry questions why an addition to his garage is being built for for yet another car if his chauffeur has quit.