Simplify the following text for a Grade 6 native English-speaking person.
Original: It currently starts at Trafalgar Square and runs east to join Fleet Street at Temple Bar , which marks the boundary of the City of London at this point , though its historical length has been longer than this .
Simplified: It currently starts at Trafalgar Square and runs east to join Fleet Street at Temple Bar . This marks the boundary of the City of London at this point in time .