Complex sentence: As the two men began to argue, Lesnar attacked Angle with an "F-5" and kept attacking Angle while McMahon watched and celebrated with him afterwards, turning back into a villain in the process.
Split into simpler sentences: As the two men began to argue, Lesnar attacked Angle with an F-5. He then attacked Angle while McMahon watched and celebrated with him afterwards, turning back into a villain in the process.