Complex sentence: Mandawa Fort was built by the then Thakur Nawal Singh Bahadur at Mandawa town which is now situated in Jhunjhunu district of Rajasthan, India.
Split into simpler sentences: Mandawa Fort was built by Thakur Nawal Singh Bahadur, when it was located at Mandawa town. It is now situated in the Jhunjhunu district of Rajasthan, India.