Complex sentence: At the 2015 Royal Rumble event, Kane and Show teamed up to eliminate several superstars, they were ultimately attacked by The Rock, which allowed The Rock's cousin Roman Reigns, to win the Rumble match by eliminating Rusev.
Split into simpler sentences: At the 2015 Royal Rumble event, Kane and Show teamed up to eliminate several superstars. They were ultimately attacked by The Rock, which allowed The Rock's cousin Roman Reigns to win the Rumble match by eliminating Rusev.