Complex sentence: He was appointed House Prefect in his senior year and he used his office to champion the development of sports and student participation in sports programmes at Mfantsipim, later becoming Team Manager for all the sports teams in the school.
Split into simpler sentences: He was appointed House Prefect in his senior year and he used his good offices to champion the development of sports and student participation in sports programmes at Mfantsipim. He would go on to become Team Manager for all the sports teams in the school.