Complex sentence: In 1979, a Pennsylvania dermatologist showed that Dove dried and irritated skin significantly less than ordinary soaps, based on which Unilever started aggressive marketing and won more than 24% of the market by 2003.
Split into simpler sentences: In 1979, a Pennsylvania dermatologist showed that Dove dried and irritated skin significantly less than ordinary soaps. As a result of this study, Unilever started aggressive marketing and won more than 24% of the market by 2003.