Complex sentence: Shakespeare devised his version of Duncan's death from an account of an earlier royal assassination, that of Malcolm II's uncle, King Duff (d.967), in his source, Raphael Holinshed's history.
Split into simpler sentences: Shakespeare devised his version of Duncan's death from an account of an earlier royal assassination, that of Malcolm II's uncle. King DufF (d.967), in his source, Raphael Holinshed's history.