Simplify the following text for a Grade 5 native English-speaking person.
Original: The London County Council Tramways was an extensive network of public street tramways that was operated by the council throughout the County of London , UK , from 1899 to 1933 , when they were taken over by the London Passenger Transport Board .
Simplified: The London County Council Tramways was a large network of public street tramways . They were formed in 1899 .