Complex sentence: Tommy and Florence Nimick devoted much of their lives to the children at the Children's Institute, and the garden is a gift from the Nimick Forbesway Foundation in order to remember the Nimick's long-term leadership at the Institute.
Split into simpler sentences: Tommy and Florence Nimick devoted their lives to the children at the Children's Institute. The garden is a gift from the Nimick Forbesway Foundation to remember the Nimick's long-term leadership at the Institute.