Complex sentence: Those who knew Howth well, like Chichester and Moore, often judged him most harshly, calling him foolish, treacherous, violent and irresponsible, and clearly he lacked the political skills of his father and grandfather.
Split into simpler sentences: Those who knew Howth well, like Chichester and Moore, often judged him most harshly, calling him foolish, treacherous, violent and irresponsible. Clearly he lacked the political skills of his father and grandfather.