Complex sentence: King Louis XV finds the Doctor, tells him that Reinette has died and gives him a letter in which Reinette expresses her hopes for the Doctor's quick return and confesses her love for him.
Split into simpler sentences: King Louis XV finds the Doctor and tells him that Reinette has died. The king gives him a letter written by Reinette, in which she expresses her hopes that the Doctor will return quickly and confesses her love for him.