Complex sentence: Medicinal use is one important facet of psychoactive drug usage, however some have postulated that the urge to alter one's consciousness is as primary as the drive to satiate thirst, hunger or sexual desire.
Split into simpler sentences: Medicinal use is one important facet of psychoactive drug usage. However, some have postulated that the urge to alter one's consciousness is as primary as the drive to satiate thirst, hunger or sexual desire.