Complex sentence: English went to Parktown Preparatory School for boys in Johannesburg and at the age of ten years was sent to board at Cordwallis school in Pietermaritzburg and in 1946 completed his schooling at Hilton College in Natal (South Africa).
Split into simpler sentences: English went to Parktown Preparatory School for boys in Johannesburg and at the age of ten years was sent to board at Cordwallis school in Pietermaritzburg and in 1946. He then completed his schooling at Hilton College in Natal (South Africa).