Complex sentence: Lord Andros Brax lead his men in the west camp to cross the river, however most of their rafts were destroy by the defenders of Riverrun, and the others that reached the northern side were easily defeated by Ser Bryden.
Split into simpler sentences: Lord Andros Brax led his men in the west camp to cross the river, however most of their rafts were destroy by the defenders of Riverrun. Those that reached the northern side were easily defeated by Ser Bryden.