Complex sentence: Jones realizes that when he points at another living creature, it causes a great pain (this is a metaphor of the age of nuclear weapons, as the novel was written two years after atomic bombings of Hiroshima and Nagasaki).
Split into simpler sentences: Jones realizes that when he points at another living creature, it causes a great pain. It is a metaphor of the age of nuclear weapons (the novel was written two years after atomic bombings of Hiroshima and Nagasaki).