Complex sentence: Suspicion then swings to Madame Chanel, the housekeeper, whose actions the night before seem suspicious; it is revealed that she has been having an affair with Pierrette, who went to see her brother that night to ask for money to pay off her debts.
Split into simpler sentences: Suspicion then swings to Madame Chanel, the housekeeper, whose actions the night before seem suspicious. It is revealed that she had been having an affair with Pierrette, who went to see her brother that night to ask for money to pay off her debts.