Complex sentence: On 18 March 1948, Jhangar, lost in December 1947 to the Pakistanis, was recaptured by troops of the Indian Army, which then started to move towards Rajauri from Naushahra sector to protect the local population from the enemy.
Split into simpler sentences: On 18 March 1948, Jhangar, lost in December 1947, was recaptured by the Indian Army. Then the Indian troops started to move towards Rajauri from Naushahra sector to protect the natives from the enemy.