Complex sentence: That competition came in the form of The Beverly Brothers (managed by The Genius), whom they defeated at SummerSlam 1992, the Disasters' first PPV pinfall in a year.
Split into simpler sentences: That competition came in the form of The Beverly Brothers with their manager The Genius. The Disasters defended against the Beverly Brothers at the 1992 Summer Slam with a pinfall victory, the Disasters first PPV pinfall in a year.