Complex sentence: Route 91 Harvest was the scene of the 2017 Las Vegas Strip shooting, the deadliest mass shooting by an individual in U.S. history, as singer Jason Aldean gave the closing performance on the final day of the festival.
Split into simpler sentences: Route 91 Harvest was the scene of the 2017 Las Vegas Strip shooting, the deadliest mass shooting by an individual in U.S. history. The shooting began as singer Jason Aldean gave the closing performance on the final day of the festival.