Complex sentence: Every Christmas from the age of five, the boys were allowed to smoke a cigarette each, and at nine were given a whole packet; when they were 14 or 15 Kingsley bought them a gross (144) of condoms.
Split into simpler sentences: Every Christmas from the age of five, the boys were allowed to smoke a cigarette each, and at nine were given a whole packet. When they were 14 or 15 Kingsley bought them a gross (144) of condoms.