Complex sentence: The East Turkestan independence movement is a broad term that refers to advocates of an independent, self-governing East Turkestan in the region now known as Xinjiang, an autonomous region in the People's Republic of China.
Split into simpler sentences: The East Turkestan independence movement is a broad term that refers to advocates of an independent, self-governing East Turkestan, also referred to as Xinjiang. Currently the area is under Chinese rule and is an autonomous region in the People's Republic of China.