Complex sentence: Subsequently, she read English at St Margaret's Hall, Oxford from which she fled, eventually marrying a penniless Austrian, Franz von Waldschutz, whose family estates in Poland had been destroyed during the First World War.
Split into simpler sentences: Subsequently, she read English at St Margaret's Hall, Oxford from which she fled. Eventually she married a penniless Austrian, Franz von Waldschutz, whose family estates in Poland had been destroyed during the First World War.