Complex sentence: The history of spark extinguishing systems goes back to the early seventies, when the Federal Anti-Pollution Law (BImSchG) of 1974 required the use of exhaust and dedusting systems in the wood-based material industry.
Split into simpler sentences: The history of spark extinguishing systems goes back to the early seventies. The newly enacted Federal Anti-Pollution Law (BImSchG) from 1974 required the use of exhaust and dedusting systems in the wood-based material industry.