Complex sentence: It was planned to become a venue for the Philippine Basketball Association (PBA) and was one of the planned venues for the 2019 FIBA Basketball World Cup, should the Philippines have won its bid to host the tournament.
Split into simpler sentences: It was planned to become a venue for the Philippine Basketball Association (PBA). The arena is one of the planned venues for the 2019 FIBA Basketball World Cup in the event the Philippines wins its bid to host the tournament.