Complex sentence: On, the World Heavyweight Championship and WWE Championship were unified in a Tables, Ladders and Chairs match between Cena and Orton, which was won by Orton and the unified championship was renamed the WWE World Heavyweight Championship.
Split into simpler sentences: On, the World Heavyweight Championship and WWE Championship were unified in a Tables, Ladders and Chairs match between Randy Orton and John Cena. The match was won by Orton and the unified championship was renamed the WWE World Heavyweight Championship.