Complex sentence: Until his retirement in 1997, Moreno managed the aquatic animal collections at the Cleveland Zoo under General Curator Don Kuenzer, he supervised animal husbandry programs for the Rainforest and Aquatics exhibits.
Split into simpler sentences: Until his retirement in 1997, Moreno managed the aquatic animal collections at the Cleveland Zoo under General Curator Don Kuenzer. He supervised animal husbandry programs for the Rainforest and Aquatics exhibits.