Complex sentence: After the February Revolution she did not flee the Tsarskoe Selo (as many her relatives did), she goes to work on World War I front, but settled in Kiev with her lover, Countess Maria Nierodt.
Split into simpler sentences: After the February Revolution she did not flee the Tsarskoe Selo (as many her relatives did). She went to work on the World War I front, but settled in Kiev with her lover, Countess Maria Nierodt.