Complex sentence: The Dibang Valley is a district of Arunachal Pradesh named after the River Dibang or the Talon as the Idus call the river, originates in the mountains of China and flows through the length of the valley, named after it.
Split into simpler sentences: The Dibang Valley is a district of Arunachal Pradesh named after the Dibang river or the Talon as the Idus call it. The river originates in the mountains of China and flows through the length of the valley, named after it.