Complex sentence: He then lost the Governor's seat in the Illinois 2014 gubernatorial election with 46.35% of the vote, to Bruce Rauner's 50.27%.
Split into simpler sentences: He then lost the Governor's seat in the Illinois 2014 gubernatorial election. However, Quinn lost the 2014 campaign with 46.35% of the vote, to Bruce Rauner's 50.27%.