Complex sentence: They take GCSE exams one in maths at the end of year ten and several other subject modules such as science and english throughout year 10they finish GCSEs in year 11 (ages 15-16), after which some students will leave to pursue their careers.
Split into simpler sentences: They take GCSE exams, one in maths at the end of year ten and several other subject modules such as science and English throughout year 10. They finish GCSEs in year 11 (ages 15-16), after which some students will leave to pursue their careers.