Simplify the following text for a Grade 7 native English-speaking person.
Original: Indicated by artifacts recovered close to the road in Milan and in other areas along the Hudson River , the earliest inhabitants of the northern Dutchess County region were the Mohicans , a Native American nation , about 3,000 years ago .
Simplified: The earliest people that lived in northern Dutchess County were the Mohicans . They were a Native American nation that came to the area about 3,000 years ago .