Complex sentence: On Prohibition, Harding, who drank, initially voted against banning alcohol, but voted for the Eighteenth Amendment, after successfully moving to modify it by placing a time limit on ratification, which was expected to kill it.
Split into simpler sentences: On Prohibition, Harding, who drank, initially voted against banning alcohol. He voted for the Eighteenth Amendment, which imposed Prohibition after successfully moving to modify it by placing a time limit on ratification, which was expected to kill it.