Complex sentence: The end of the official existence of "Dacia Traiana" province came under Aurelian (270--275), but modern Dobruja became a separate province under the name of Scythia Minor in 297.
Split into simpler sentences: The end of the official existence of "Dacia Traiana" province came in the 270s. Modern Dobruja became a separate province under the name of Scythia Minor in 297.