Complex sentence: In 1999, Pan took part in singing contest "BBC Star" while he was an intern at the Broadcasting Corporation of China and performed the song "Can't Wait" by Steve Seungjun Yoo and Yuki Hsu in the finals.
Split into simpler sentences: In 1999, Pan took part in singing contest "BBC Star" while interning at the Broadcasting Corporation of China. He performed "Can't Wait" by Steve Seungjun Yoo and Yuki Hsu in the finals.