Complex sentence: Encouraged by Roger Williams to settle on the Narragansett Bay, he and other supporters of Hutchinson bought Aquidneck Island of the Narragansetts, and settled there, establishing the town of Pocasset, later named Portsmouth.
Split into simpler sentences: Encouraged by Roger Williams to settle on the Narragansett Bay, he and other supporters of Hutchinson bought Aquidneck Island of the Narragansetts. They settled there, establishing the town of Pocasset which was later named Portsmouth.