Complex sentence: Chimney Point on Lake Champlain in Vermont is one of the earliest, mostly intensely settled, and most strategic sites in the Champlain Valley, with human habitation going back as far as 7,500 years.
Split into simpler sentences: Chimney Point on Lake Champlain in Vermont is one of the earliest, mostly intensely settled, and most strategic sites in the Champlain Valley. Archeological research has revealed evidence of human habitation going back as far as 7,500 years.