Complex sentence: Zaparoan tongues were once widely spoken in the rain forest of north-eastern Peru, but Zaparoan-speaking people have been decimated by diseases, wars with neighboring native groups, and by quasi-enslavement during the rubber boom.
Split into simpler sentences: Zaparoan tongues were once widely spoken in the rain forest of north-eastern Peru. Zaparoan speaking people have been decimated by diseases, wars with neighboring native groups and by quasi-enslavement during the rubber boom.