Original sentence: The Sixteen Kingdoms (), or less commonly the Sixteen States, were a collection of numerous short-lived sovereign states in China proper and its neighboring areas from 304 to 439 CE after the retreat of the Jin Dynasty (265-420) to South China and before the establishment of the Northern Dynasties
Edited sentence: The Sixteen Kingdoms (), or less commonly the Sixteen States, were a collection of numerous short-lived sovereign states in China proper and its neighboring areas from 304 to 439 AD after the retreat of the Jin Dynasty (265-420) to South China and before the establishment of the Northern Dynasties