Complex sentence: Apart from teaching in school and composing, Tajcevic was very active as a choral conductor, leading numerous choirs including "Balkan", "Srpsko pevacko društvo", and "Sloga" before moving to Belgrade in 1940, where he continued his conducting activity.
Split into simpler sentences: Apart from teaching in school and composing, Tajcevic was also very active as a choral conductor. He led the choirs "Balkan", "Srpsko pevacko društvo", and "Sloga" before moving to Belgrade in 1940, where he continued his conducting activity.