Complex sentence: Because he is a recluse, it has been difficult for fans of Negativland and sometimes even the band themselves to contact him and in the past, he has shown up in virtual form at Negativland concerts or on Negativlandland on a TV screen.
Split into simpler sentences: Because he is a recluse, it has been difficult for fans of Negativland. Even the band themselves to contact him and in the past, he has shown up at Negativland concerts or Negativlandland on a TV screen.