Complex sentence: Playing on this sectarian divide the afghan government (dominated by the ethnic pushtuns) divided them politically also.The afghan govt listed them as a seperate nationality in the list of the ethnic groups of afghanistan, thereby reducing the hazara population in the national percentage.
Split into simpler sentences: Playing on this sectarian divide the Afghan government (dominated by the ethnic Pushtuns) divided them politically also. The Afghan government listed them as a separate nationality in the list of the ethnic groups of Afghanistan, thereby reducing the Hazara population in the national percentage.