Complex sentence: It was constructed for the first Comahue National Fair, a 45-day event held in 1964 that aimed to expose the economical potential of the Comahue Region, as well as to commemorate the 40th anniversary of the founding of Villa Regina.
Split into simpler sentences: It was constructed for the first Comahue National Fair, in 1964. This was a 45-day event that aimed to expose the economic potential of the Comahue Region, as well as commemorating the 40th anniversary of the founding of Villa Regina.