Complex sentence: The land that has become Angola Penitentiary was purchased as four contiguous plantations by Isaac Franklin from Francis Routh during the 1830s with the profits from his slave trading firm, Franklin and Armfield, of Alexandria, Virginia and Natchez, Mississippi.
Split into simpler sentences: The land that has been developed as Angola Penitentiary was purchased as four contiguous plantations by Isaac Franklin from Francis Routh during the 1830s. He used profits from his slave trading firm, Franklin and Armfield, of Alexandria, Virginia and Natchez, Mississippi.