Original sentence: Fidel Alejandro Castro Ruz (born August 13, 1926) has been in power in Cuba since 1959, when, leading the 26th of July Movement, he overthrew the regime of Fulgencio Batista, and transformed Cuba into the first Communist state in the Western Hemisphere.In several published biographies, Castro is characterized as a dictator, although this is disputed.Some studies report that up to 130,000 political opponents and dissidents have been killed during Castro's decades-long leadership
Edited sentence: Fidel Alejandro Castro Ruz (born August 13, 1926) has held the highest political authority in Cuba since 1959, when, leading the 26th of July Movement, he overthrew the regime of Fulgencio Batista, and transformed Cuba into the first Communist state in the Western Hemisphere.Some studies report that tens of thousands of political opponents have been killed during Castro's decades-long leadership