Complex sentence: However, Jevad, the commander of the Eighth Army ordered von Oppen to cross the Jordan River instead and after successfully crossing all the German and some of the Ottoman soldiers, the 11th Cavalry Brigade attacked and closed that line of retreat.
Split into simpler sentences: However, Jevad, the commander of the Eighth Army ordered von Oppen to cross the Jordan River. Following his commander's orders von Oppen succeeded in getting all the German and some of the Ottoman soldiers, across the Jordan River before the 11th Cavalry Brigade attacked and closed that line of retreat.