Complex sentence: The Tehuelche originally spoke Tehuelche, a Chon language, but later, with the Araucanization of Patagonia, many tribes started to speak variants of Mapudungun.
Split into simpler sentences: The Tehuelche originally spoke Tehuelche, a Chon language. Later, with the Araucanization of Patagonia, many tribes started to speak variants of Mapudungun.