Complex sentence: Christopher Wren was the first person to be interred, in 1723: on the wall above his tomb in the crypt is written, "Lector, si monumentum requiris, circumspice" ("Reader, if you seek his monument, look around you").
Split into simpler sentences: Christopher Wren was the first person to be interred, in 1723. On the wall above his tomb in the crypt is written, "Lector, si monumentum requiris, circumspice" ("Reader, if you seek his monument, look around you").