Complex sentence: The extension, a key part of the Hudson Yards Redevelopment Project, is expected to bring business and entertainment into the area, as well as aid redevelopment of nearby Chelsea and Hell's Kitchen, located around the Long Island Rail Road's West Side Yard.
Split into simpler sentences: The extension, a key part of the Hudson Yards Redevelopment Project, is expected to bring business and entertainment into the area. It is also intended to aid redevelopment of nearby Chelsea and Hell's Kitchen around the Long Island Rail Road's West Side Yard.