Complex sentence: The next day Scottie follows Madeleine to his own house, where she is delivering a thankyou note to him for rescuing her, and they decide to spend the day together because Scottie fears Madeleine might attempt suicide again.
Split into simpler sentences: The next day Scottie follows Madeleine to his own house, where she posts a note to him for rescuing her. They decide to spend the day together because Scottie fears Madeleine might attempt suicide again.