Complex sentence: He was approached in 1976 to design it, later oversaw its construction and saved money from the construction budget to build a greenhouse to study which indigenous plants and flowers would be appropriate for the site.
Split into simpler sentences: He was approached in 1976 to design it and later oversaw its construction. A portion of construction budget was saved and used to build a greenhouse to study indigenous plants and flowers that would be appropriate for use on the site.