Complex sentence: He was a member of the combined Australian University Test Team at the 1998 Australasian Championships in Sydney, and reached the semi-finals of the 1999 World Debating Championships in Manila.
Split into simpler sentences: He was a member of the combined Australian University Test Team at the 1998 Australasian Championships in Sydney, where he reached the semi-finals. He also reached the semi-finals of the 1999 World Debating Championships in Manila.