Complex sentence: The son of Air Marshal (retd) Mohd Asghar Khan, Omar belonged to an Afridi/Pashtun family from Tirah, which settled in Kashmir and then moved to Abbottabad during the Indo-Pak partition.
Split into simpler sentences: The son of Air Marshal (retd) Mohd Asghar Khan, Omar belonged to an Afridi/Pashtun family from Tirah which settled in Kashmir. The family moved to Abbottabad during the Indo-Pak partition.