Complex sentence: He began his professional ballet training at 14, at the Royal Winnipeg Ballet School, then moved on to the Kirov Academy of Ballet in Washington DC, where he studied on a full scholarship for two years.
Split into simpler sentences: He began his professional ballet training at 14 at the Royal Winnipeg Ballet School. He then moved on to the Kirov Academy of Ballet in Washington DC where he studied on a full scholarship for two years.