Complex sentence: As with cocaine in Coca-Cola and marijuana in milk lithium was widely marketed as one of a number of patent medicine products popular in the late-19th and early-20th centuries, and was the medicinal ingredient of a refreshment beverage, 7 Up.
Split into simpler sentences: As with cocaine in Coca-Cola and marijuana in milk. Lithium was widely marketed as one of a number of patent medicine products popular in the late-19th and early-20th centuries, and was the medicinal ingredient of a refreshment beverage, 7 Up.