Complex sentence: He was later appointed Assistant Secretary in the office of the Prime Minister Uganda and received rapid promotions, amongst other for saving the life of Sir Edward Mutesa II, and he also served as OAU expert during the Congo crisis.
Split into simpler sentences: He was later appointed Assistant Secretary in the office of the Prime Minister. He received rapid promotions, amongst other for saving the life of Sir Edward Mutesa II, and service as OAU expert during the Congo crisis.