Complex sentence: A nostrum known as "Jamaican ginger" was ordered to change its formula by Prohibition officials; to fool a chemical test, some vendors added a toxic chemical, cresyl phosphate, an organophosphate compound that had effects similar to a nerve agent.
Split into simpler sentences: A nostrum known as "Jamaican ginger" was ordered to change its formula by Prohibition officials. To fool a chemical test some vendors added a toxic chemical, cresyl phosphate, an organophosphate compound that had effects similar to a nerve agent.