Complex sentence: The following week on "Raw", Heyman addressed the Survivor Series match, stating that they underestimated Goldberg and that the match was a humiliation and embarrassment for him and Lesnar, who would also be in the Royal Rumble as he has something to prove.
Split into simpler sentences: The following week, Paul Heyman addressed the Survivor Series match, stating that they underestimated Goldberg, and that the match was a humiliation and embarrassment for him and Lesnar. He then stated that Lesnar would also be in the Royal Rumble as he has something to prove.