Complex sentence: According to Estyn the school has a GCSE pass rate (based on 5 GCSEs, grades A-C) of 83% being the third best performing secondary school in Wales.
Split into simpler sentences: According to Estyn the school has a GCSE pass rate (based on 5 GCSEs, grades A-C) of 83%. This means that it is the third best performing secondary school in Wales.