Simplify the following text for a Grade 8 native English-speaking person.
Original: The London Passenger Transport Board ( LPTB ) was the organization responsible for public transport in London , UK , and its environs from 1933 to 1948 . In common with all London transport authorities from 1933 to 2000 , the public name and operational brand of the organization was London Transport .
Simplified: The London Passenger Transport Board was set up by the London Passenger Transport Act 1933 enacted on 13 April 1933 .