Complex sentence: The novel is dedicated to Stanley Kubrick, who directed the adaption of Burgess's novel "A Clockwork Orange", who himself had intended to make a biographical film of Bonaparte, but was dissatisfied with his own screenplay.
Split into simpler sentences: The novel is dedicated to Stanley Kubrick, who had directed the adaption of Burgess's previous novel, "A Clockwork Orange". Kubrick himself had intended to make a biographical film about Bonaparte, but was dissatisfied with his own screenplay.