Complex sentence: The Expulsion of Chileans from Bolivia and Peru in 1879 was ordered by decrees of the allied governments of Bolivia (on 1 March) and Peru (on 15 April) at the beginning of the War of the Pacific (1879-1883).
Split into simpler sentences: The Expulsion of Chileans from Bolivia and Peru in 1879 was ordered by decrees of the allied governments of Bolivia (on 1 March) and Peru (on 15 April). The event took place at the beginning of the War of the Pacific (1879-1883).