Complex sentence: One of the largest aquariums in North America, the aquarium has an average annual attendance of 1.8 million visitors and, as of 2016, over 50 million people have visited the aquarium since it opened in 1984.
Split into simpler sentences: One of the largest aquariums in North America, the aquarium has an average annual attendance of 1.8 million visitors. As of 2016, over 50 million people have visited the aquarium since it opened in 1984.