Complex sentence: She was first married to Constantin Cantacuzino, one of Romania's top fighter aces of the war and an aristocrat, possibly a prince, from 1946 to his death in 1958.
Split into simpler sentences: She was first married to Constantin Cantacuzino, a Romanian aristocrat who was one of Romania's top fighter aces of the war. They were married from 1946 to his death in 1958.