Complex sentence: Before 1914, the aristocracy of all Europe was fond for gathering in it; then-sharing the same area with the most important embassies-the hotel hosted a series of international meetings, relevant to the historical development of the First World War.
Split into simpler sentences: Before 1914, the aristocracy of all Europe was fond for gathering in it. Also, sharing the same area with the most important embassies, the hotel hosted a series of international meetings, relevant to the historical development of the First World War.