Complex sentence: Winslet was attracted to the idea of playing a woman whose aspirations had not come to fruition, and she read "The Feminine Mystique" to understand the psychology of unhappy housewives from the era.
Split into simpler sentences: Winslet was attracted to the idea of playing a woman whose aspirations had not come to fruition. She read "The Feminine Mystique" to understand the psychology of unhappy housewives from the era.