Complex sentence: After discussions with his older brother Joseph Emory Davis, Jefferson decided to resign from the Army so that he could marry Sarah, and returned to Mississippi to develop his Brierfield Plantation next to his brother's Hurricane Plantation.
Split into simpler sentences: After discussions with his older brother Joseph Emory Davis, Jefferson decided to resign from the Army so that he could marry Sarah. He returned to Mississippi to develop his Brierfield Plantation next to his brother's Hurricane Plantation.