Complex sentence: Tetrabenazine is a drug for the symptomatic treatment of hyperkinetic movement disorder and is marketed under the trade names Nitoman in Canada and Xenazine in New Zealand and some parts of Europe, and is also available in the USA as an orphan drug.
Split into simpler sentences: Tetrabenazine is a drug for the symptomatic treatment of hyperkinetic movement disorders. It is marketed under the trade names Nitoman in Canada and Xenazine in New Zealand and some parts of Europe, and is available as Xenazine in the United States as an orphan drug.