Complex sentence: Although Edge had lost his scheduled match at New Year's Revolution, that would not be his only match that evening as the main event saw John Cena, the reigning WWE Champion, defend his title in an Elimination Chamber match.
Split into simpler sentences: Although Edge had lost his scheduled match at New Year's Revolution, that would not be his only match that evening. The main event of the pay-per-view saw John Cena, the reigning WWE Champion, defend his title in an Elimination Chamber match.