Complex sentence: Instead of allowing a vote to proceed on this motion, the PC government brought in their own bill, the essence of which allowed public, Catholic, and private school entities to decide whether or not they would allow a Gay-Straight Alliance in their district.
Split into simpler sentences: Instead of allowing a vote to proceed on this motion, the PC government brought in their own bill. The essence of which allowed public, Catholic, and private school entities to decide whether or not they would allow a Gay Straight Alliance in their district.