Complex sentence: During invasion by father-son duo Sahu Bin Ataullah and Saiyyad Salar Masud in 1031-1033 AD, the rulers of upper region of Ghaghara River and adjoining parts were much disturbed to find a foreigner in their country, soon they formed a local confederacy.
Split into simpler sentences: During invasion by father-son duo Sahu Bin Ataullah and Saiyyad Salar Masud in 1031-1033 AD. The rulers of upper region of Ghaghara River and adjoining parts were much disturbed to find a foreigner in their country, soon they formed a local confederacy.