Answer:
There were, in effect, two key breakthroughs in the translation of the Rosetta stone. The first was by an English polymath, Thomas "Phenomenon". Young (1773-1829), famous for such other discoveries as the wave properties of light, Young's modulus, and numerous other researches in optics, engineering and medicine.
Through the work of many linguists and archaeologists the Rosetta Stone became a tool to decipher ancient Egyptian hieroglyphics, making scholars and archaeologists able to translate an innumerable amount of cravings, scripts, and wall inscriptions. Information could be gathered from hieroglyphics that could date back thousands of years.
(Hope this helps) Sky