Original sentence: Late Egyptian possibly appeared as a vernacular language as early as 1600 BC,  but was not used as a written language until  during the Amarna Period of the New Kingdom— Late Egyptian evolved into Demotic by the 7th century BC, and although Demotic remained a spoken language until the 5th century AD, it was gradually replaced by Coptic beginning in the 1st century AD
Edited sentence: Late Egyptian possibly appeared as a vernacular language as early as 1600 BC,  but was not used as a written language until  during the Amarna Period of the New Kingdom Late Egyptian evolved into Demotic by the 7th century BC, and although Demotic remained a spoken language until the 5th century AD, it was gradually replaced by Coptic beginning in the 1st century AD