Complex sentence: Additional genetic evidence of the Atacama skeleton indicated that it lived only 6--8 years, and the mother was possibly "an indigenous woman from the Chilean region of South America".
Split into simpler sentences: Additional genetic evidence of the Atacama skeleton indicated that it lived only 6--8 years. The remains have an estimated age of only a few decades, and the mother was most probably "an indigenous woman from the Chilean region of South America".