Complex sentence: Paea Wolfgramm, Tonga's only Olympic medallist at that time (he had won a silver medal in boxing at the 1996 Summer Olympics), spoke of the promise of sports development and was the highlight of both presentations.
Split into simpler sentences: Paea Wolfgramm, Tonga's only Olympic medallist at that time (he had won a silver medal in boxing at the 1996 Summer Olympics). He spoke of the promise of sports development and was the highlight of both presentations.