Complex sentence: On November19,1936 he became principal of Dongsung Commerce High School (동성상업고등학교 교장; 東星商業高等學校 校長), taking on the additional role as principal of Gyesong Elementary School (계성국민학교; 啓星國民學校) in Jongro, Seoul in April 1939.
Split into simpler sentences: On November19,1936, he became principal of Dongsung Commerce High School (동성상업고등학교 교장; 東星商業高等學校 校長). At the same time he took on the additional role of principal of Gyesong Elementary School (계성국민학교; 啓星國民學校) in Jongro, Seoul in April 1939.