Complex sentence: Before 1968, Hải Dương was a town in the Hải Dương Province, except from 1968 until 1996 during which time it was the capital town of Hải Hưng Province, after the provinces of Hải Dương and Hưng Yên merged to form Hải Hưng.
Split into simpler sentences: Before 1968, Hải Dương was a town in the Hải Dương Province. Between 1968 and 1996 it was the capital town of Hải Hưng Province, after the provinces of Hải Dương and Hưng Yên merged to form Hải Hưng.