Complex sentence: The fort was captured by the Maratha forces under Raghunathrao in 1758, before being captured by the Bhangi Sikh Dynasty-one of the 12 Sikh Misls of Punjab that ruled Lahore from 1760 until 1799.
Split into simpler sentences: The fort was captured by the Maratha forces under Raghunathrao in 1758. Then the Bhangi Sikh Dynasty (1716--1810), one of the 12 Sikh Misls of Punjab ruled the city of Lahore from 1760 until 1799.