Complex sentence: The brothers would also go on to feud with both Stone Cold Steve Austin and Mankind during this period and it was ultimately revealed that they had begun working together, uniting to form the team that became known as The Brothers of Destruction.
Split into simpler sentences: The brothers would also go on to feud with both "Stone Cold" Steve Austin and Mankind during this period. Following the conclusion of these events, the rivalry seemed to cease as Undertaker and Kane united, forming the team that became known as The Brothers of Destruction.