Complex sentence: Fiji were upset by Wales 21-14 in their quarter-final-a Fijian victory would have guaranteed them the overall 2006-07 Series crown, but after their loss and New Zealand's tournament victory-New Zealand won the overall series.
Split into simpler sentences: Fiji were upset by Wales 21-14 in their quarter-final. A Fijian victory would have guaranteed them the overall 2006-07 Series crown, however, as a result of their loss and New Zealand's tournament victory, New Zealand won the overall series.