Complex sentence: In the Qing Dynasty, Pingyao was the centre of Chinese banking industry, a county in contemporary time famous for its UNESCO ancient city walls and ancient China's Wall Street for its financial importance in history.
Split into simpler sentences: In the Qing Dynasty, Pingyao served as the centre of Chinese banking industry. This county, in contemporary time, is famous for its UNESCO ancient city walls and ancient China's Wall Street for its financial importance in history.