Complex sentence: Although the site is on the same mountain as the Berghof, Hitler only visited the Kehlsteinhaus around 10 times, usually for no more than 30 minutes.
Split into simpler sentences: Although the site is on the same mountain as the Berghof, Hitler rarely visited the property. It has been suggested he only visited the Kehlsteinhaus around 10 times, usually for no more than 30 minutes.