Complex sentence: The Great Dismal Swamp maroons were maroons, escaped slaves, who lived freely as an established community within the marshlands of the Great Dismal Swamp in what today is Virginia and North Carolina, whereas other maroons settled in the swamps and forests of the Deep South.
Split into simpler sentences: The Great Dismal Swamp maroons were maroons, escaped slaves, who lived freely as an established community within the marshlands of the Great Dismal Swamp in what today is Virginia and North Carolina. Additional maroons settled in the swamps and forests of the Deep South.