Complex sentence: Moses commissioned famed New York City bridge designer Othmar Ammann, the man behind the George Washington, Bronx-Whitestone, Verrazano-Narrows, and Triborough bridges.
Split into simpler sentences: Moses commissioned famed New York City bridge designer Othmar Ammann. Ammann was the man behind the George Washington, Bronx-Whitestone, Verrazano-Narrows, and Triborough bridges.