Complex sentence: The elected member, Imran Khan (leader of PTI), won three separate seats in the General Election, and he chose to keep NA-56, therefore vacating this seat and triggering a by-election, which took place on 22nd August 2015.
Split into simpler sentences: The elected member, Imran Khan (leader of PTI), won three separate seats in the General Election, and he chose to keep NA-56. This resulted in him vacating this seat and triggering a by-election, which took place on 22nd August 2015.