Complex sentence: They were chased to the fort of Skardu which was invested by Zorawar for a few days ---one night the Dogras scaled the steep mountain behind the fort and after some fighting captured the small fort on its crest.
Split into simpler sentences: They were chased to the fort of Skardu which was invested by Zorawar for a few days. One night the Dogras scaled the steep mountain behind the fort and after some fighting captured the small fort on its crest.