Complex sentence: One of the early investigators into keto-enol tautomerism was Richard August Carl Emil Erlenmeyer and his Erlenmeyer rule (developed in 1880) states that all alcohols in which the hydroxyl group is attached directly to a double-bonded carbon atom become aldehydes or ketones.
Split into simpler sentences: One of the early investigators into keto-enol tautomerism was Richard August Carl Emil Erlenmeyer. His Erlenmeyer rule (developed in 1880) states that all alcohols in which the hydroxyl group is attached directly to a double-bonded carbon atom become aldehydes or ketones.