Complex sentence: SummerSlam (2016) is an ongoing professional wrestling pay-per-view event and WWE Network event produced by WWE that is taking place on August 21,2016 at the United Center in Chicago, Illinois.
Split into simpler sentences: SummerSlam (2016) is an upcoming professional wrestling pay-per-view event and WWE Network event produced by WWE. It will take place on August 21,2016 at the United Center in Chicago, Illinois.