Complex sentence: Versois was the sister of actresses Marina Vlady, Hélène Vallier and Olga Baïdar-Poliakoff; her father was a noted artist of Russian heritage.
Split into simpler sentences: Versois was the sister of actresses Marina Vlady, Hélène Vallier and Olga Baïdar-Poliakoff. Their father was a noted artist of Russian heritage.