Complex sentence: Claus Reuther, an official of the Forestry Commission, played a leading role, setting up the "Aktion Fischotterschutz" in Braunlage in 1979 which took part in the scientific investigation programme.
Split into simpler sentences: Claus Reuther, an official of the Forestry Commission, played a leading role. He set up the "Aktion Fischotterschutz" in Braunlage in 1979 which took part in the scientific investigation programme.