Complex sentence: He was manager of the Seremban branch (1935 to 1936), manager of the Ipoh branch (1937 to 1941), manager of the Penang branch (1946 to 1954) and then returned to the head office in Singapore in 1958.
Split into simpler sentences: He was manager of the Seremban branch (1935 to 1936), manager of the Ipoh branch (1937 to 1941), manager of the Penang branch (1946 to 1954). He then returned to the head office in Singapore in 1958.