Complex sentence: When Bareiro died in 1880, Caballero seized power in a coup and dominated Paraguayan politics for most of the next two decades, either as president or through his power in the militia.
Split into simpler sentences: When Bareiro died in 1880, Caballero seized power in a coup. Caballero dominated Paraguayan politics for most of the next two decades, either as president or through his power in the militia.