Complex sentence: He worked with Alfred Hitchcock on his early films, including "Blackmail", Britain's first talkie, and is credited as screenwriter with "The Guns of Loos" 1928 and "The Lady From the Sea", 1929.
Split into simpler sentences: He worked with Alfred Hitchcock on "Blackmail", Britain's first talkie, and others of Hitchcock's early films. He was also a screenwriter, credited with "The Guns of Loos" 1928 and "The Lady From the Sea", 1929.