Simplify the following text for a Grade 10 native English-speaking person.
Original: The British Transport Commission ( BTC ) was created by Clement Attlee 's post-war Labor government as a part of its nationalisation program , to oversee railways , canals and road freight transport in Great Britain ( Northern Ireland had the separate Ulster Transport Authority ) .
Simplified: The British Transport Commission ( BTC ) was created by Clement Attlee 's post-war Labor government . It was a part of its nationalisation program .