Complex sentence: Extracting ergine from "A. nervosa" seeds is illegal in the USA, since it is classified as a schedule-III depressant by the DEA, although the substance has hallucinogenic/psychedelic properties.
Split into simpler sentences: Extracting ergine from "A. nervosa" seeds is illegal in the USA, since it is a scheduled substance. It is classified as a schedule III depressant by the DEA, although the substance has hallucinogenic/psychedelic properties.