Original sentence: Independent parties reported that both Communists and anti-Communist vigilantes were engaging in wholesale slaughter throughout the area, and that the United States Army took the city and failed to prevent the perpetuation of the civilian murders
Edited sentence: Independent parties reported that both Communists and anti-Communist vigilantes were engaging in wholesale slaughter throughout the area, and that the United States Army took the city and failed to prevent the perpetuation of the civilian murders, but did not participate themselves