Complex sentence: The wearing of low-cut dresses which exposed breasts were considered more acceptable than they are today; with a woman's bared legs, ankles, or shoulders being considered to be more risqué than exposed breasts.
Split into simpler sentences: The wearing of low-cut dresses that exposed breasts were considered more acceptable than they are today. A woman's bared legs, ankles, or shoulders were considered more risqué than exposed breasts.