Complex sentence: In the middle of the 17th century, the Augustinian monuments settled in Erfurt again, but elsewhere: they converted the Valentinerhof, which is situated next to the Wigbert church, to a monastery.
Split into simpler sentences: In the middle of the 17th century, Augustinian monks settled in Erfurt again, but they lived on at a different site. They converted the Valentinerhof (St. Valentine's courtyard), which is situated next to the (St. Wigbert's Church), into a monastery.