Complex sentence: Desmethyletizolam (also known as Metizolam) is a thienodiazepine that is closely related to Etizolam and has been sold online as a designer drug.
Split into simpler sentences: Desmethyletizolam (also known as metizolam) is a thienodiazepine that is closely related to etizolam. It has been sold online as a designer drug.