Complex sentence: The Muslim population of the district migrated to Pakistan and many refugees, the Hindus and the Sikhs of Sialkot and Tehsil Shakargarh, migrated to Gurdaspur after crossing the Ravi bridge.
Split into simpler sentences: The Muslim population of the district migrated to Pakistan. Many refugees, the Hindus and the Sikhs of Sialkot and Tehsil Shakargarh, migrated to Gurdaspur after crossing the Ravi bridge.