Complex sentence: It remains privately owned by descendants of the first owners, although a share of the ownership has now been donated to the Bermuda Zoological Society, which supports educational programs at the Bermuda Aquarium, Museum and Zoo.
Split into simpler sentences: It remains privately owned by descendants of the first owners. Now a share of the ownership has been donated to the Bermuda Zoological Society which supports educational programs at the Bermuda Aquarium, Museum and Zoo.