Complex sentence: The 21 year old that died at Voodoo Fest was reported to have drank alcoholic beverages for "several hours" before, as with many unresearched psychoactive substances; this sort of combination is not advised.
Split into simpler sentences: The 21 year old that died at Voodoo Fest was reported to have consumed alcoholic beverages for "several hours" beforehand. As with many unresearched psychoactive substances, this sort of combination is not advised.