Complex sentence: He rewrote several of Shakespeare's plays, including "King Lear", which he altered by supplying a happy ending in which Cordelia survives marries Edgar, and the Fool is written out of the play entirely.
Split into simpler sentences: He rewrote several of Shakespeare's plays, including "King Lear". Tate's version of King Lear has a happy ending in which Cordelia survives, marries Edgar, and the Fool is written out of the play entirely.