Complex sentence: While 1,4-butanediol is not currently scheduled federally in the United States, it is illegal to distribute it over the internet except in certain cases, a number of states have classified 1,4-butanediol as a controlled substance.
Split into simpler sentences: While 1,4-butanediol is not currently scheduled federally in the United States, it is illegal to distribute it over the internet except in certain cases. Additionally, a number of states have classified 1,4-butanediol as a controlled substance.