Complex sentence: The armed forces were already waging the Operativo Independencia against the subversives ERP in the Tucumán Province, the decree expanded their area of operations to the whole country, as neither the Argentine Anticommunist Alliance nor the police were enough to stop the guerrillas.
Split into simpler sentences: The armed forces were already waging the Operativo Independencia against the subversives ERP in the Tucumán Province. The decree expanded their area of operations to the whole country, as neither the Argentine Anticommunist Alliance nor the police were enough to stop the guerrillas.