Complex sentence: He attempted to cash in his contract against WWE Champion John Cena on the episode of "Raw" following WrestleMania; however, upon Cena recuperating from Swagger's blindside attack, Swagger retracted his statement and did not cash in his contract.
Split into simpler sentences: He attempted to cash in his contract against WWE Champion John Cena on the episode of "RAW" following WrestleMania. However, upon Cena recuperating from Swagger's attack, Swagger did not cash in his contract.