Complex sentence: Youzhou is cited in some ancient sources as one of the nine or twelve original provinces of China during early Chinese antiquity (22nd Century BC), but Youzhou was used in actual administration from 106 BC to the 10th Century AD.
Split into simpler sentences: Youzhou is cited in some ancient sources as one of the nine or twelve original provinces of China during early Chinese antiquity (22nd Century BC). But Youzhou was used in actual administration from 106 BC to the 10th Century AD.