Complex sentence: Towards the end of his tenure, the RAAF's wartime area command system was transformed into a structure based on function rather than geography, and Southern Area was reformed as Training Command in October 1953.
Split into simpler sentences: Towards the end of his tenure, the RAAF's wartime area command system was transformed into a structure based on function rather than geography. As a result, Southern Area was reformed as Training Command in October 1953.