Complex sentence: Moisturizers or emollients are complex mixtures of chemical agents specially designed to make the external layers of the skin (epidermis) softer and more pliable, by increasing its hydration (water content) by reducing evaporation.
Split into simpler sentences: Moisturizers or emollients are complex mixtures of chemical agents specially designed to make the external layers of the skin (epidermis) softer and more pliable. They increase the skin's hydration (water content) by reducing evaporation.