Complex sentence: ALD-52 or N-acetyl-LSD, is a chemical analogue of LSD-25 (D-Lysergic Acid Diethylamide), originally discovered by Albert Hofmann, but later just filed away until the rise in popularity of psychedelics in the 1960s.
Split into simpler sentences: ALD-52 or N-acetyl-LSD, is a chemical analogue of LSD-25 (D-Lysergic Acid Diethylamide). It was originally discovered by Albert Hofmann but was not widely studied until the rise in popularity of psychedelics in the 1960s.