Original sentence: A principle of purification was adopted whereby the new rulers sought to establish a "pure army" and "pure society", untainted by the colonial past and devoted to Marxist ideals.As a consequence, it increasingly began to rely on the conscription of black Africans to fight against the nationalist guerrilla forces.By the end of the war in 1974 due to the events of the Carnation revolution in Lisbon, a situation was created in which black Africans were, in effect,  fighting their own black countrymen, under the command of white officers.The leftist government was soon overthrown and Portugal converted to a democratic government.They had a larger number of black ethnic  than white ethnic European soldiers.Thousands of black Africans, Portuguese citizens after the legal changes operated in 1962, were integrated into the Portuguese army, initially in units created along ethnic lines, and therefore about 50% of all Portuguese Army combatants were native black Africans
Edited sentence: A principle of purification was adopted whereby the new rulers sought to establish a "pure army" and "pure society", untainted by the colonial past and devoted to Marxist totalitarianism.As a consequence, it increasingly began to rely on the conscription of native black Africans to fight against the nationalist guerrilla forces.By the end of the war in 1974 due to the events of the Carnation revolution in Lisbon, a situation was created in which black Africans were, in effect, being fighting their own black countrymen.The communist government was soon overthrown and Portugal converted to a democratic government.They had a larger number of black native ethnic Africans than white ethnic European soldiers.Thousands of African Portuguese black citizens were integrated into the Portuguese army, initially in units created along ethnic lines, and therefore about 50% of all Portuguese Army combatants were native black Africans