Complex sentence: The Common Tasks for Assessment (or CTAs) educational programme is a compulsory programme in South Africa which all year nine students have to take, whereafter they can decide to leave school without matriculation or to continue until grade twelve.
Split into simpler sentences: The Common Tasks for Assessment (or CTAs) are part of a compulsory educational programme in South Africa. At the end of Grade 9 they can decide to leave school without matriculation or to continue until grade twelve.