Complex sentence: In the present, Verbal tells Kujan the story of Keyser Söze: after his Hungarian rivals invaded his home and demanded his territory, he surprised them by killing his own wife and children, then massacred the entire mob.
Split into simpler sentences: In the present, Verbal tells Kujan the story of Keyser Söze. In response, Söze surprised them by killing his own wife and remaining children, then massacred the entire mob.