Complex sentence: It is the terminus for the West Anglia Main Line to Cambridge; the busier Great Eastern Main Line to Norwich; many local commuter services to parts of east London, Essex, and Hertfordshire; and the Stansted Express, a fast link to London Stansted Airport.
Split into simpler sentences: It is the terminus of two main lines: the West Anglia Main Line to Cambridge and the busier Great Eastern Main Line to Norwich. In addition, Liverpool Street is the terminus of the Stansted Express, a fast link to London Stansted Airport.