I'm not sure what you mean, Hiro. In the given sentence, 'every one of whom' refers to some fans, I suppose, mentioned earlier in the context, yes. But what clause are you speaking of?
Aha! (I am saying that a lot tonight. I am missing lots of things.)
No, the original is not a complete sentence; it is a dependent clause. If you replace 'whom' with 'them' or 'those fans', however, you do get an independent sentence.