Complex sentence: The seaweed samples were directly dated between 14,220 to 13,980 years ago, confirming that the upper layer of the site, labeled Monte Verde II, was occupied more than 1,000 years earlier than any other reliably dated human settlements in the Americas.
Split into simpler sentences: The seaweed samples were directly dated between 14,220 to 13,980 years ago. The dating of the seaweed samples puts occupation of MV-II more than 1,000 years earlier than any other reliably dated human settlements in the Americas.