Complex sentence: A letter written by Pope Clement IV to his nephew Peter Grossi in 1256 includes the earliest known mention of the Ring of the Fisherman, used for sealing all private correspondence by pressing the ring into red sealing wax melted onto a folded piece of paper or envelope.
Split into simpler sentences: A letter written by Pope Clement IV to his nephew Peter Grossi in 1256 includes the earliest known mention of the Ring of the Fisherman. The pope described its use, sealing all private correspondence by pressing the ring into red wax melted onto a folded piece of paper or envelope.