Complex sentence: Although cannabis is often considered either in its own unique category or as a mild psychedelic, the drug, notably the chemical compound cannabidiol in it, still does nevertheless have many depressant effects such as muscle relaxation, sedation, decreased alertness, and tiredness.
Split into simpler sentences: Although cannabis is often considered either in its own unique category or as a mild psychedelic. The chemical compound cannabidiol, which is found in cannabis, has many depressant effects such as muscle relaxation, sedation, decreased alertness, and tiredness.