Complex sentence: On April 17,2015, KCON said the California convention would expand to a three day event, July 31-August 2, and would move from the Los Angeles Memorial Sports Arena to L.A. Live and the Staples Center in Downtown Los Angeles.
Split into simpler sentences: On April 17,2015, KCON announced that its convention in California would expand to a three day event on July 31 through August 2. It was also announced that the convention would move from the Los Angeles Memorial Sports Arena to L.A. Live and the Staples Center in Downtown Los Angeles.