Complex sentence: In 1952 archeologist Thomas E. Lee discovered Sheguiandah on the island, a prehistoric site with artifacts of the Paleo-Indian and Archaic periods, dating at least to 10,000 BC and possibly to 30,000 years ago.
Split into simpler sentences: In 1952 archeologist Thomas E. Lee discovered Sheguiandah on the island, a prehistoric site. During excavation, he found artifacts of the Paleo-Indian and Archaic periods, dating at least to 10,000 BC and possibly to 30,000 years ago.