Complex sentence: After the first verse, Aguilera appeared from behind the cake and joined Spears; both of them started writhing on the stage and crawling, depicting Madonna's performance of the song at the 1984 MTV Video Music Awards.
Split into simpler sentences: After the first verse, Aguilera appeared from behind the cake and joined Spears. Both of them started writhing on the stage and crawling, depicting Madonna's performance of the song at the 1984 MTV Video Music Awards.