Complex sentence: Psychopharmacology studies a wide range of substances with various types of psychoactive properties, though the professional and commercial fields of pharmacology and psychopharmacology don't typically focus on psychedelic or recreational drugs; the majority of studies are conducted on psychiatric medication.
Split into simpler sentences: Psychopharmacology studies a wide range of substances with various types of psychoactive properties. The professional and commercial fields of pharmacology and psychopharmacology do not typically focus on psychedelic or recreational drugs, and so the majority of studies are conducted on psychiatric medication.