Complex sentence: The service is the only Transport for London contracted route to serve the section of the A2 road through Blackheath Hill; in April 2003 subsidence in a chalk mine beneath the road led to the road being closed and the route being diverted via Lewisham.
Split into simpler sentences: The service is the only Transport for London contracted route to serve the section of the A2 road through Blackheath Hill. In April 2003 subsidence in a chalk mine beneath the road led to the road being closed and the route being diverted via Lewisham.