Complex sentence: T.F. Mitchell claimed that there is no language which is totally syllable-timed or totally stress-timed-all languages display both sorts of timing; languages will, however, differ in which type of timing predominates.
Split into simpler sentences: T.F. Mitchell claimed that there is no language which is totally syllable-timed or totally stress-timed; rather, all languages display both sorts of timing. Languages will, however, differ in which type of timing predominates.