Complex sentence: Jack Hanna (an American zookeeper who is the Director Emeritus of the Columbus Zoo and Aquarium) criticized the zoo's actions to cull Marius and stated that the cull would never have occurred in America.
Split into simpler sentences: Jack Hanna (an American zookeeper who is the Director Emeritus of the Columbus Zoo and Aquarium) criticized the zoo's actions to cull Marius. He stated that the cull would never have occurred in America.