Complex sentence: The Harrison Narcotics Tax Act of 1914 restricted the manufacture and distribution of opiates, including laudanum, and coca derivatives in the United States; this was followed by France's' in 1916, and Britain's Dangerous Drugs Act in 1920.
Split into simpler sentences: The Harrison Narcotics Tax Act of 1914 restricted the manufacture and distribution of opiates, including laudanum, and coca derivatives in the US. This was followed by France's' in 1916, and Britain's Dangerous Drugs Act in 1920.