Complex sentence: Nicoll became Deputy Colonial Secretary of the British Crown Colony Trinidad and Tobago in 1937, Colonial Secretary of the British Colony of Fiji in 1944 and then as administrator and Colonial Secretary of Hong Kong in 1949.
Split into simpler sentences: Nicoll became Deputy Colonial Secretary of the British Crown Colony Trinidad and Tobago in 1937, the Colonial Secretary of the British Colony of Fiji from 1944 to 1949. This was followed by his appointment as administrator and Colonial Secretary of Hong Kong in 1949.