Complex sentence: The conservatory opened in 1969 and was constructed through a donation from Prentice Bloedel, which was also used to cover the water reservoir on top of Queen Elizabeth Park and to provide covered walkways, lighted fountains and art work.
Split into simpler sentences: The conservatory opened in 1969 and was constructed through a donation from Prentice Bloedel. That same donation was used to cover the water reservoir on top of Queen Elizabeth Park and to provide covered walkways, lighted fountains and art work.