Complex sentence: In the Middle Ages the London residences of the great nobles were generally situated within the walls of the City of London but gradually spread onto The Strand, the main ceremonial thoroughfare from The City to the Palace of Westminster where parliamentary and court business were transacted.
Split into simpler sentences: In the Middle Ages the London residences of the nobility were generally situated within the walls of the City of London. They gradually spread onto the Strand, the main ceremonial thoroughfare from the City to the Palace of Westminster, where parliamentary and court business were transacted.