Complex sentence: The line begins at Town Hall station in the City Circle, after Central station it travels underground via Sydney Airport then emerges at Wolli Creek where it runs as 4 tracks to Beverly Hills, then as two tracks to Glenfield Junction.
Split into simpler sentences: The line begins at Town Hall station in the City Circle. After Central station it travels underground via Sydney Airport then emerges at Wolli Creek where it runs as 4 tracks to Beverly Hills, then as two tracks to Glenfield Junction.