Complex sentence: Clobazam ZA Patent 6800803 (marketed under the brand names Frisium, Urbanol and Onfi), is a benzodiazepine derivative that has been marketed as an anxiolytic since 1975 and an anticonvulsant since 1984.
Split into simpler sentences: Clobazam ZA Patent 6800803 (marketed under the brand names Frisium, Urbanol and Onfi), is a drug. A benzodiazepine derivative, it has been marketed as an anxiolytic since 1975 and an anticonvulsant since 1984.