Original sentence: " Null responded by saying: "The guardians of the gates of orthodoxy at PBS... you don't know who their friends are.Null has made several films on public policy issues, personal health, and personal development that have screened at various festivals, some of which are posted on YouTube
Edited sentence: " Null responded by alleging an effort to silence him, saying: "The guardians of the gates of orthodoxy at PBS... you don't know who their friends are.Null has made several of what he calls documentary films on public policy issues, personal health, and personal development that are posted on YouTube