Complex sentence: At the same time, she visited Han Hie-sun lived in Changdeokgung Naksunjae, the last kitchen court lady in Joseon Dynasty, she was learn from her Korean royal court cuisine until 30 years.
Split into simpler sentences: At the same time, she visited Han Hui-sun who lived at Changdeokgung, Naksunjae. Han Hui-sun was the last kitchen court lady in Joseon Dynasty, and Hye-seong learned Korean royal court cuisine from her for 30 years.