Simplify the following text for a Grade 9 native English-speaking person.
Original: In 1964 , the Strand Underpass , a road tunnel , was opened to alleviate northbound traffic flow from Waterloo Bridge to Kingsway . The underpass took over a section of the tram tunnel , and rises at its north end through the former location of the Aldwych tramway station .
Simplified: The Strand Underpass , which opened in 1964 , comes to surface level part way through the former location of the Aldwych tramway station .