Complex sentence: In the 1920s, fashionable hemlines for women began to raise exposing the legs to just below the knees, and stockings also came into vogue to maintain leg coverage, as well as some level of warmth.
Split into simpler sentences: In the 1920s, fashionable hemlines for women began to rise, exposing the legs to just below the knees. Stockings also came into vogue to maintain leg coverage, as well as some level of warmth.