Complex sentence: Of all the celebrity involvement in The New School at West Heath-aside from Al Fayed-is the involvement of entertainer and singer Madonna, who visited the school in 2010 and funded one kept-publicly-anonymous pupil's entire educational progression through the school.
Split into simpler sentences: Of all the celebrity involvement in The New School at West Heath-aside from Al Fayed-is the involvement of Madonna (entertainer). She visited the school in 2010 and funded one kept-publicly-anonymous pupil's entire educational progression through the school.