Original sentence: Joaquin Fermandois criticized Kornbluh's "black and white" and "North American centered conception of world affairs", noting that a variety of internal and external factors, including covert actions by Cuba and the Soviet Union (which cost hundreds of thousands of dollars), also played a role and that a careful reading of the documentary record reveals the CIA was largely "impotent".This view has been contradicted by several historians, and supported by others
Edited sentence: It has, however, been supported by others.This view has been contradicted by several historians, who have stated that the covert support of the United States was crucial to the preparation for the coup, the coup itself, and the consolidation of the regime afterward