Complex sentence: For centuries the tribes of the Amazon had been evangelized by the Jesuits until their expulsion from the Portuguese empire in the late eighteenth century and targeted by slave catchers, rubber tappers, and even some military operations.
Split into simpler sentences: For centuries the tribes of the Amazon had been evangelized by the Jesuits until their expulsion from the Portuguese empire in the late eighteenth century. It had been targeted by slave catchers, rubber tappers, and even some military operations.