Complex sentence: Fighters loyal to Amanullah Khan challenged Governor Ismail Khan's authority; officials with Ismail Khan said that Amanullah Khan enjoyed some tacit support from Afghan's capital Kabul, who wanted to use his opposition to curb Ismail Khan's power.
Split into simpler sentences: Fighters loyal to Amanullah Khan challenged Governor Ismail Khan's authority. Officials with Ismail Khan said that Amanullah Khan enjoyed some tacit support from Afghan's capital Kabul, who wanted to use his opposition to curb Ismail Khan's power.