Make the paragraph simpler:
Bolas were most famously used by the gauchos (South American rouge, outlaw cowboys), but have been found in excavations of Pre-Columbian settlements, especially in Patagonia, where indigenous peoples (particularly the Tehuelche) used them to catch 200-pound " guanaco " (llama-like mammals) and " n ̃ andu ́ " (birds).
They are used by the gauchos in South America today, but have been found in excavations of pre-Hispanic settlements, especially in Patagonia, where indigenous peoples used them to catch guanaco and n ̃ andu.