original: In 1972, arsonists set the bunker on fire.
simplifications: Arsonists set the bunker on fire in 1972. In 1972, some people set the bunker on fire. Arsonists are people who set fires. In 1972, they set the bunker on fire. In 1972, arsonists lit the bunker on fire. Arsonists set fire to the bunker in 1972. In 1972, the bunker was set on fire. Arsonists set the bunker on fire in 1972. Arsonists set the bunker on fire in 1972. arsonists set fire to the bunker in 1972. In 1972, the arsonists set fire to the bunker.