Simplify the following text for a Grade 10 native English-speaking person.
Original: It is the main street running north from Parliament Square , towards traditional Charing Cross , now at the southern end of Trafalgar Square and marked by the statue of Charles I , which is often regarded as the heart of London .
Simplified: It is the main artery running north from Parliament Square , towards Charing Cross at the southern end of Trafalgar Square .