Complex sentence: He served as an Intelligence Officer in South Africa from 1901--1904 and was then appointed to the Far Eastern desk of the War Office Intelligence Department, following the removal of an Officer found to have made basic mistakes in the role.
Split into simpler sentences: He served as an Intelligence Officer in South Africa from 1901--1904. In 1904 he was appointed to the Far Eastern desk of the War Office Intelligence Department following the removal of an Officer found to have made basic mistakes in the role.