Complex sentence: Lorraine was being hassled by a man so she remained with Pat to catch up and seeing Lorraine's sorry existence was enough to make Pat realise that she'd left her promiscuous lifestyle well behind her.
Split into simpler sentences: Lorraine was being hassled by a man so she remained with Pat to catch up. Seeing Lorraine's sorry existence was enough to make Pat realise that she'd left her promiscuous lifestyle well behind her.