Complex sentence: At the age of sixteen Jan embarked on the next stage of his education: the headmaster entered him for the entrance exam for Victoria College, a prominent Afrikaans college in Stellenbosch.
Split into simpler sentences: At the age of sixteen it was time for Jan to embark on the next stage of his education. The headmaster entered him for the entrance exam for Victoria College, a prominent Afrikaans college in Stellenbosch.