Complex sentence: Pearl Witherington was born and raised in France, but a British subject, she was employed at the British embassy in Paris and engaged to Henri Cornioley (1910-1999) when the Germans invaded.
Split into simpler sentences: Pearl Witherington was born and raised in France but was a British subject. She was employed at the British embassy in Paris and engaged to Henri Cornioley (1910-1999) when the Germans invaded.