Complex sentence: After four ride patrons were killed on it in late October 2016 the ride, and Dreamworld, was closed, first during the incident investigation, then on 9 November Ardent Leisures' CEO announced that the ride would not reopen, and was to be demolished.
Split into simpler sentences: After four ride patrons were killed on it in late October 2016 the ride, and Dreamworld, was closed. On 9 November Ardent Leisures' CEO announced that the ride would not reopen, and was to be demolished.