Complex sentence: Bernard defends himself by presenting the Director with his long-lost lover, Linda, and unknown son, John, who falls to his knees and calls Thomas his father, which causes an uproar of laughter.
Split into simpler sentences: Bernard defends himself by presenting the Director with his long-lost lover, Linda, and unknown son, John. John falls to his knees and calls Thomas his father, which causes an uproar of laughter.