Original sentence: " Null responded by saying: "The guardians of the gates of orthodoxy at PBS... you don't know who their friends are.Gary Null is also a promoter of "AIDS denialism"—that is, the belief that HIV is harmless and is not the cause of AIDS.He sells documentaries on his website that outline this debate.His views are supported by many leading scientists, who have argued that there is no scientific proof that HIV causes AIDS.Null has made award-winning documentary films on public policy issues, personal health, and personal development that have screened at festivals around the world,  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.Gary Null is also a promoter of AIDS denialism—that is, the belief that HIV is harmless and is not the cause of AIDS.He sells self-made films on his website that promote AIDS denialism.Null has made several of what he calls documentary films on public policy issues, personal health, and personal development that are posted on YouTube