Complex sentence: He later became the head of a Japan department, since 1964 as an extraordinary professor, within the Institute of Ethnology, which was transferred to an independent institute for Japanese studies in 1965.
Split into simpler sentences: He later became the head of a Japan department. From 1964 he was promoted to Professor extraordinarius, within the Institute of Ethnology, which was transferred to an independent institute for Japanese studies in 1965.