Complex sentence: Turtle Back Zoo is not recognized by the American Zoo and Aquarium Association, but most recently applied for accreditation in June, 2006, with an announcement of whether or not the attempt is successful due in September.
Split into simpler sentences: Turtle Back Zoo is not recognized by the American Zoo and Aquarium Association. The zoo most recently applied for accreditation in June, 2006, with an announcement of whether or not it will become an AZA member due in September.