Complex sentence: They were interrupted by Mr. Kennedy who claimed to be McMahon's "illegitimate son", but he was also interrupted by a lawyer claiming Kennedy was not McMahon's son and that the real son would be revealed the following week on "Raw".
Split into simpler sentences: They were interrupted by Mr. Kennedy, who claimed to be McMahon's "illegitimate son". He was himself interrupted by a lawyer claiming Kennedy was not McMahon's son and that the real son would be revealed the next week on "Raw".