Complex sentence: At Fastlane on February 22,2015, Lana set up a distraction which led to Rusev defeating John Cena, however, at WrestleMania 31, Rusev lost the championship to Cena after Rusev accidentally crashed into Lana, knocking her off the ring apron.
Split into simpler sentences: At Fastlane on February 22,2015, Lana set up a distraction which led to Rusev defeating John Cena. However, at WrestleMania 31, Rusev lost the championship to Cena after Rusev accidentally crashed into Lana, knocking her off the ring apron.