Complex sentence: In 1876 Austro-Bohemian Countess Bertha Kinsky became Alfred Nobel's secretary, but after only a brief stay she left him to marry her previous lover, Baron Arthur Gundaccar von Suttner.
Split into simpler sentences: In 1876 Austro-Bohemian Countess Bertha Kinsky became Alfred Nobel's secretary. But after only a brief stay she left him to marry her previous lover, Baron Arthur Gundaccar von Suttner.