Complex sentence: The Nubayrah Stele is a mutilated copy of the Decree of Memphis (Ptolemy V) on a limestone stele; the same decree is found upon the Rosetta Stone.
Split into simpler sentences: The Nubayrah Stele is a mutilated copy of the Decree of Memphis (Ptolemy V) on a limestone stele. The same decree is found upon the Rosetta Stone.