Complex sentence: The Funj were an ethnic group in present day Sudan their origins are not clearly known but they moved into Nubia from south of the swamplands in the early sixteenth century, fleeing pressure from the Shilluk.
Split into simpler sentences: The Funj were an ethnic group in present day Sudan. Their origins are not clearly known, but they are recorded as moving into Nubia from the Sudd to the south in the early sixteenth century, fleeing the pressure of the Shilluk.