Complex sentence: No candidate won more than 50% of the vote, so a runoff between the top two candidates, David Perdue and Jack Kingston, was held on July 22,2014, where Perdue won with 50.9% of the vote.
Split into simpler sentences: No candidate won more than 50% of the vote, so a runoff was held between the top two candidates, David Perdue and Jack Kingston. The runoff was held on July 22,2014, which Perdue won with 50.9% of the vote.