Complex sentence: The Chiefs were told that Article XIV of the treaty allowed people to remain in the east, their homeland, but that the state of Mississippi would extend its law over the Choctaws and the people could no longer live under their own government and laws.
Split into simpler sentences: The Chiefs were told that Article XIV of the treaty allowed people to remain in the east, their homeland. They were told that the state of Mississippi would extend its law over the Choctaws and the people could no longer live under their own government and laws.