Complex sentence: McNamara made the headlines again after an incident on the evening of December 20,2007, when he ran from his home, forcibly entered a neighbour's house, leapt from a second-floor window, and broke both of his legs.
Split into simpler sentences: McNamara made the headlines again after an incident on December 20,2007. That evening, McNamara ran from his home, forcibly entered a neighbour's house, leapt from a second-floor window, and broke both of his legs.