Complex sentence: In 1997, the Connecticut Zoological Society, a nonprofit support group for the zoo, purchased the zoo from the city and continues to run the zoo as a private, nonprofit institution with assistance from the State of Connecticut and the City of Bridgeport.
Split into simpler sentences: In 1997, the Connecticut Zoological Society, a nonprofit support group for the zoo, purchased the zoo from the city. The society continues to run the zoo as a private, nonprofit institution with assistance from the state of Connecticut and the city of Bridgeport.