Complex sentence: The league opened its 2014--15 season at the Philippine Arena in Bocaue, Bulacan; this was the first time that the league had its opening ceremonies outside Metro Manila and it was the first non-Iglesia ni Cristo and commercial event that was held in the arena.
Split into simpler sentences: The league opened it's 2014-15 season at the Philippine Arena in Bocaue, Bulacan. This was the first time that the league had its opening ceremonies outside Metro Manila and it was the first non-Iglesia ni Cristo and commercial event that was held in the arena.