Complex sentence: The school is an accredited member of the Council of International Schools (CIS) and of the International Baccalaureate Organisation (IBO), and is affiliated to London's Edexcel Examination Board and the Cambridge International Examinations Board.
Split into simpler sentences: The school is accredited by the Council of International Schools (CIS) and the International Baccalaureate Organisation (IBO). It is affiliated to London's Edexcel Examination Board and the Cambridge International Examinations Board.