Original sentence: Some people have suggested that the American government engineered the events so that they could attack Afghanistan for its gas and attack Iraq for its oil.Such controlled demolitions can take up to two months to prepare.This has suggested to some that explosives were used and had been placed on every floor near all the steel joints of the building before September 11th.[6] () The Commission also stated that "9/11 plotters eventually spent somewhere between $400,000 and $500,000 to plan and conduct their attack", but that the specific origin of the funds used to execute the attacks remained unknown
Edited sentence: Conspiracy theorists have suggested that the American government engineered the events so that they could attack Afghanistan for its gas and attack Iraq for its oil.No credible evidence of any such American-backed conspiracy has ever been presented, and proponents of such theories have been widely denounced as crackpots.The Commission also stated that "9/11 plotters eventually spent somewhere between $400,000 and $500,000 to plan and conduct their attack", but that the specific origin of the funds used to execute the attacks remained unknown