Complex sentence: Ideally, high-fidelity equipment has minimal amounts of noise and distortion and an accurate frequency response as set out in 1973 by the German "Deutsches Institut für Normung" (DIN) standard DIN 45500.
Split into simpler sentences: Ideally, high-fidelity equipment has minimal amounts of noise and distortion and an accurate frequency response. One effort to standardize the term was the 1973 German "Deutsches Institut für Normung" (DIN) standard DIN 45500.