Complex sentence: During this time Anna Sacher makes the legendary "Haus Österreich" from her hotel and gains more and more social influence, but the outbreak of the First World War will change their lives and that of their guests forever.
Split into simpler sentences: During this time Anna Sacher makes the legendary "Haus Österreich" from her hotel and gains more and more social influence. But the outbreak of the First World War will change their lives and that of their guests forever.