Complex sentence: The project has, therefore, focused attention on the long-delayed Second Avenue Subway along the far East Side of Manhattan, which is now back under construction and is expected to relieve north/south commuting pressure emanating from Grand Central Terminal.
Split into simpler sentences: The project has, therefore, focused attention on the long-delayed Second Avenue Subway along the far East Side of Manhattan, which is now back under construction. It is expected to relieve north/south commuting pressure emanating from Grand Central Terminal.