Complex sentence: During the 1980s, the Guatemalan military assumed almost absolute government power for five years; it had successfully infiltrated and eliminated enemies in every socio-political institution of the nation, including the political, social, and intellectual classes.
Split into simpler sentences: During the 1980s, the Guatemalan military assumed almost absolute government power for five years. It had successfully infiltrated and eliminated enemies in every socio-political institution of the nation, including the political, social, and intellectual classes.