Complex sentence: Suhail was reinforced by Usman ibn Abi Al Aas from Persepolis, and Hakam ibn Amr from Busra, the combined forces defeated Raja Rasil at the Battle of Rasil, who retreated to the eastern bank of River Indus.
Split into simpler sentences: Suhail was reinforced by Usman ibn Abi Al Aas from Persepolis, and Hakam ibn Amr from Busra. The combined forces defeated Raja Rasil at the Battle of Rasil, who retreated to the eastern bank of the River Indus.