Complex sentence: The song takes its name from a Republican poster of the time, displaying a photograph of a young child killed by Nationalist under a sky of bombers with the stark warning "If you tolerate this, your children will be next" written at the bottom.
Split into simpler sentences: The song takes its name from a Republican poster of the time. A photograph of a young child killed by Nationalist bombs is shown under a sky of bombers with the stark warning "If you tolerate this, your children will be next" written at the bottom.