Complex sentence: Owing to its prime location on a hill overlooking the Erms Valley, Hohenurach Castle was built around 1025, and in the Middle Ages Bad Urach (at that time only known as Urach) became a centre of power.
Split into simpler sentences: Owing to its prime location on a hill overlooking the Erms Valley, Hohenurach Castle was built around 1025. In the Middle Ages Bad Urach (at that time only known as Urach) became a centre of power.