Complex sentence: One of Alfred Hitchcock's favourite devices for driving the plots of his stories and creating suspense was what he called the "MacGuffin"; the "Oxford English Dictionary," credits MacPhail as being the inventor of the term.
Split into simpler sentences: One of Alfred Hitchcock's favourite devices for driving the plots of his stories and creating suspense was what he called the "MacGuffin". However the "Oxford English Dictionary," credits MacPhail as being the true inventor of the term.