Complex sentence: Ross identified Eve as "a contradiction inside an enigma", and based her performance on Catherine Halsey from Ayn Rand's 1943 novel "The Fountainhead" and Eve White from the 1957 film "The Three Faces of Eve".
Split into simpler sentences: Ross identified Eve as "a contradiction inside an enigma". She based her performance on Catherine Halsey from Ayn Rand's 1943 novel "The Fountainhead", and Eve White from the 1957 film "The Three Faces of Eve".