Original: In 1868 the Yusufzai, instigated by the Khan of Agror, who resented the establishment of the police post at Oghi in the Agror valley, attacked that post in force, but were repulsed.
Simplified: In 1868 the Yusufzai helped by the Khan of Agror, who was upset that the British had set up a police post at Oghi in the Agror valley, attacked that post with many men.