Complex sentence: Lac is the only commercial resin of animal origin and this a natural polymer is made up of hydroxy fatty acids, principally aleuritic acid (9,10,16-trihydroxyhexadecanoic acid), and hydroxy sesquiterpenic acids.
Split into simpler sentences: Lac is the only commercial resin of animal origin and this a natural polymer. It is made up of hydroxy fatty acids, principally aleuritic acid (9,10,16-trihydroxyhexadecanoic acid), and hydroxy sesquiterpenic acids.