Complex sentence: He was sent to boarding prep school at the age of eight and then to Harrow School before leaving in 1971 having passed three O-levels exams, he failed his accountancy exams with Touche Ross on three occasions.
Split into simpler sentences: He was sent to boarding prep school at the age of eight and then to Harrow School before leaving in 1971 having passed three O-levels exams. He failed his accountancy exams with Touche Ross on three occasions.