Complex sentence: The company was founded in September 1979 as result of the fusion of Celulosa Arauco S.A. (1967) and Celulosa Constitución S.A. (1969), both companies had been privatized during the Pinochet Era from CORFO in 1977 and 1979 respectively.
Split into simpler sentences: The company was founded in September 1979 as result of the fusion of Celulosa Arauco S.A. (1967) and Celulosa Constitución S.A. (1969). Both companies had been privatized during the Pinochet Era from CORFO in 1977 and 1979 respectively.