Complex sentence: In 1887, the Montgomerys moved to Bolivar County south of Clarksdale in the rich delta country of northwestern Mississippi, where Isaiah founded an all-black agricultural community, Mound Bayou, located on the Mississippi River.
Split into simpler sentences: In 1887, the Montgomerys moved to Bolivar County south of Clarksdale in the rich delta country of northwestern Mississippi. There Montgomery founded an all-black agricultural community, Mound Bayou, located on the Mississippi River.