Complex sentence: The astute general double-backed to Kartse where he sheltered his troops through the winter--in the spring of 1835 he defeated the large Ladakhi army of Banko Kahlon and marched his victorious troops towards Leh.
Split into simpler sentences: The astute general doubled back to Kartse where he sheltered his troops through the winter. In the spring of 1835 he defeated the large Ladakhi army of Banko Kahlon and marched his victorious troops towards Leh.