Complex sentence: The manuscript consists in a papyrus written in demotic--hence the name--found during the Napoleonic campaign in Egypt and now stored at the Bibliothèque nationale de France (Pap.215).
Split into simpler sentences: The manuscript consists in a papyrus written in demotic; hence, its name. It was found during the Napoleonic campaign in Egypt and now stored at the Bibliothèque nationale de France (Pap.215).