Complex sentence: Although a growing hit, Bill Barker disappeared from the public (and underground) eye sometime in late september of 2001 long-running website is dead and the post office box he had used for years now returns his mail unread.
Split into simpler sentences: Although a growing hit, Bill Barker disappeared from the public (and underground) eye sometime in late september of 2001. His long-running website is dead and the post office box he had used for years now returns his mail unread.