Complex sentence: The Manhattan Bridge connection and the Grand Street station opened on November 26,1967 (10 years and a day after the project began), while the Williamsburg Bridge connection and 57th Street station opened on July 1,1968.
Split into simpler sentences: The Manhattan Bridge connection and the Grand Street station opened on November 26,1967, almost exactly 10 years after the project began. The Williamsburg Bridge connection and 57th Street station opened on July 1,1968.