Complex sentence: Afterhours clubs are popularly known as centers (but not exclusively) of third-party Illegal drug trade, as well as other related insomniac or late-hour party activity-the dancefloor is most likely to be very upbeat and energetic.
Split into simpler sentences: Afterhours clubs are popularly known as centers (but not exclusively) of third-party Illegal drug trade, as well as other related insomniac or late-hour party activity. The dancefloor is most likely to be very upbeat and energetic.