Original sentence: The term probably originates in a vernacular translation of the Medieval Latin name for the region: Marchia orientalis, which translates as "eastern border," as it was situated at the eastern edge of the Holy Roman Empire, that was also mirrored in the name Ostmark applied after Anschluss to the Third Reich
Edited sentence: The term probably originates in a vernacular translation of the Medieval Latin name for the region: Marchia orientalis, which translates as "eastern border," as it was situated at the eastern edge of the Holy Roman Empire, that was also mirrored in the name Ostmark applied after Anschluss by the Third Reich