Complex sentence: Lactic acid, also known as milk acid, is a chemical compound that plays a role in several biochemical processes and was first isolated in 1780 by the Swedish chemist Carl Wilhelm Scheele.
Split into simpler sentences: Lactic acid, also known as milk acid, is a chemical compound that plays a role in several biochemical processes. It was first isolated in 1780 by the Swedish chemist Carl Wilhelm Scheele.