Complex sentence: The Pee Dee tribe (also spelled Pedee and Peedee) are a nation of American Indians of the southeast United States; their population is concentrated in the Piedmont of present-day South Carolina.
Split into simpler sentences: The Pee Dee people (also spelled Pedee and Peedee) are American Indians of the Southeast United States. Historically, their population has been concentrated in the Piedmont of present-day South Carolina.