Complex sentence: The new line will connect to the existing Epping to Chatswood railway line, which will be converted to rapid transit standards--this project is called Sydney Metro Northwest and is expected to open in 2019.
Split into simpler sentences: The new line will connect to the existing Epping to Chatswood railway line, which will be converted to rapid transit standards. The entire project is called Sydney Metro Northwest and is expected to open in 2019.