Complex sentence: The Sudd (Arabic سد, "sadd", "barrier") is a vast swamp formed by the White Nile, here called the Bahr el Jebel in southern Sudan.
Split into simpler sentences: The Sudd (Arabic سد, "sadd", "barrier") is a vast swamp formed by the White Nile. It is also called the Bahr el Jebel in southern Sudan.