Original: The British sent more than four expeditions to subdue the Black Mountain Tribes between 1852 to 1892 because Ata Mohammad Khan Swati, the Khan of Agror and Arsala Khan of Allai, and his sons intrigued against the British Government.
Simplified: The British sent armies more than four times to try and control the Black Mountain Tribes from 1852 to 1892, because some leaders of the tribes opposed the British Government.