Complex sentence: The mission province of Guale was situated along the Atlantic coast and Sea Islands, north of the Altamaha River and south of the Savannah River, and including Sapelo Island, St. Catherines Island, Ossabaw Island, Wassaw Island, and Tybee Island, among others.
Split into simpler sentences: The mission province of Guale was situated along the Atlantic coast and Sea Islands, north of the Altamaha River and south of the Savannah River. It included Sapelo Island, St. Catherines Island, Ossabaw Island, Wassaw Island, and Tybee Island, among others.