Complex sentence: The Boleyn Ground is the name of the football stadium of West Ham United F.C.; however, it is more commonly known as Upton Park after the area of London in which it is located.
Split into simpler sentences: The Boleyn Ground is the official name of Upton Park, the football stadium of West Ham United. Today the ground is far more commonly known as Upton Park, after the area of London in which it is located.