Original sentence: However, this is contradicted by the discovery of the original secret document giving the order to eliminate the Cossacks found amongst Moscow archives and by the late Soviet historian Dmitri Volkogonov, who asserted that "almost a third of the Cossack population was exterminated on Lenin’s orders
Edited sentence: General Dmitri Volkogonov alleged that "almost a third of the Cossack population was exterminated on Lenin’s orders