Complex sentence: It was founded in 1821 by Scots-Irish American Ephraim Dukes on a land grant and he named the settlement for his hometown of Greencastle, Pennsylvania, and was incorporated into the state in 1822.
Split into simpler sentences: It was founded in 1821 by Scots-Irish American Ephraim Dukes on a land grant. He named the settlement for his hometown of Greencastle, Pennsylvania and it was incorporated into the state in 1822.