Complex sentence: Critics have remarked that no evidence exists of Nigro's Hollywood career other than his own claims, and most film historians, and those involved in the making of "King Kong", have rejected Nigro's claims as false or unverifiable.
Split into simpler sentences: Critics have remarked that no evidence exists of Nigro's Hollywood career other than his own claims. Most film historians, and those involved in the making of "King Kong", have rejected Nigro's claims as false or unverifiable.