Complex sentence: Brutalism has some severe critics, including the architectural critic Maurice Jay, as well as Charles, Prince of Wales, whose speeches and writings on architecture have excoriated Brutalism, calling many of the structures "piles of concrete".
Split into simpler sentences: Brutalism has some severe critics, including Charles, Prince of Wales. His speeches and writings on architecture have excoriated Brutalism, calling many of the structures "piles of concrete".