Complex sentence: The term "medical marijuana" post-dates the U.S. Marijuana Tax Act of 1937, enacted by the Franklin D. Roosevelt administration, the effect of which made cannabis prescriptions illegal in the United States.
Split into simpler sentences: The term "medical marijuana" post-dates the U.S. Marijuana Tax Act of 1937. Enacted by the Franklin D. Roosevelt administration, the tax act made cannabis prescriptions illegal in the United States.