Complex sentence: All students have to sit for a Senior Secondary Certificate Examination (SSCE), of which there are two: the West African Senior Secondary Certificate Examination (WASSCE) and the National Examination Council SSCE.
Split into simpler sentences: All students have to sit for a Senior Secondary Certificate Examination (SSCE). There are two of this: the West African Senior Secondary Certificate Examination (WASSCE) and the National Examination Council SSCE.