Complex sentence: Sambhaji led the Marathas valiantly against a much stronger opponent but in 1689, he was betrayed by Ganoji Shirke and captured, tortured and killed by Aurangzeb.
Split into simpler sentences: Sambhaji led the Marathas valiantly against a much stronger opponent. But in 1689, he was betrayed by Ganoji Shirke and was captured, tortured and killed by Aurangzeb.