Complex sentence: The second match was for the WWE Tag Team Championship between Matt Hardy and Montel Vontavious Porter against Deuce'N Domino, who dominated early in the match and mocked the champions because of their rivalry over MVP's WWE United States Championship.
Split into simpler sentences: The second match was for the WWE Tag Team Championship between Matt Hardy and Montel Vontavious Porter and Deuce'N Domino. The two dominated in the match earlier and even mocked the champions because of their rivalry over MVP's WWE United States Championship.