Complex sentence: Edward VII and Queen Alexandra visited the hall (when Edward was still Prince of Wales) in 1869, and again on 6 July 1909, when they stayed at Worsley New Hall with the Countess of Ellesmere.
Split into simpler sentences: Edward VII and Queen Alexandra visited the area on 6 July 1909. They stayed at Worsley New Hall with the Countess of Ellesmere.