Complex sentence: In 1954 he was elected assistant professor, in 1961 as professor and in 1968 as tenured professor at the medical faculty in Sarajevo; he became director of the clinic as of 1969.
Split into simpler sentences: In 1954 he was elected assistant professor, in 1961 as professor and in 1968 as tenured professor of the medical faculty in Sarajevo. He became director of the clinic as of 1969.