Complex sentence: The first section of the Nassau Expressway was a long one-way eastbound segment between Cross Bay Boulevard and 150th Street (at the current JFK Expressway), interchanging with the Van Wyck Expressway at JFK Airport.
Split into simpler sentences: The first section of the Nassau Expressway was a, one-way eastbound segment between Cross Bay Boulevard and 150th Street, near the current JFK Expressway. The eastbound Nassau Expressway intersected with the Van Wyck Expressway at JFK Airport.