Complex sentence: Built in 723 by Emperor Xuanzong of the Tang dynasty as part of the Huaqing Palace (華清宮), the hot springs became famous as the supposed scene of Xuanzong's love story with his Precious Consort Yang Guifei.
Split into simpler sentences: Built in 723 by Emperor Xuanzong of the Tang dynasty as part of the Huaqing Palace (華清宮). The hot springs became famous as the supposed scene of Xuanzong's love story with his Precious Consort Yang Guifei.