Complex sentence: The discovery was reported in "Courrier de l'Égypte", the official newspaper of the French expedition, in September: the anonymous reporter expressed a hope that the stone might one day be the key to deciphering hieroglyphs.
Split into simpler sentences: The discovery was reported in September in "Courrier de l'Égypte", the official newspaper of the French expedition. The anonymous reporter expressed a hope that the stone might one day be the key to deciphering hieroglyphs.