Complex sentence: The County of Jülich united with the County of Berg in 1348, and in 1380 the Emperor elevated the counts of Berg to the rank of dukes, thus originating the Duchy of Jülich-Berg.
Split into simpler sentences: The County of Jülich united with the County of Berg in 1348. In 1380 the Emperor elevated the counts of Berg to the rank of dukes, thus originating the Duchy of Jülich-Berg.