Complex sentence: The U16's recorded a great achievement this year by getting to the quarter finals of the National Sevens (Roslyn Park), only to lose out by one point to the team which went on to the final.
Split into simpler sentences: The U16's recorded a great achievement in its own right this year by getting to the quarter finals of the National Sevens (Roslyn Park). Only to lose out by one point to the team which went on to the final.