Original sentence: His leadership has been marked by the implementation of programs that arguably increased the nation's literacy rate and provided universal healthcare to the Cuban populace, tensions with the United States that peaked in the Cuban Missile Crisis of 1962, and a close partnership with the Soviet Union, and unprecedented political and social repression against dissention
Edited sentence: His leadership has been marked by the implementation of programs that greatly increased the nation's literacy rate and provided universal healthcare to the Cuban populace, tensions with the United States that peaked in the Cuban Missile Crisis of 1962, and a close partnership with the Soviet Union