Complex sentence: BJ (Broadcast Jockey) and people who are watching broadcast can interact with each other through chatting and BJ would claim to be their "avatar" which will exactly follow what people ask him or her to do.
Split into simpler sentences: BJ (Broadcast Jockey) and people who are watching broadcast can interact with each other through chatting. BJ sometimes claim to be the audience's "avatar" and will exactly follow what people ask them to do.