Complex sentence: From 1152 to 1154 Nicholas was in Scandinavia as papal legate, organizing the affairs of the new Norwegian archbishopric of Nidaros (now Trondheim), creating the diocese at Hamar, and, according to tradition, he formed Cathedral schools in Norway's bishopric cities.
Split into simpler sentences: From 1152 to 1154 Nicholas was in Scandinavia as papal legate, organizing the affairs of the new Norwegian archbishopric of Nidaros (now Trondheim). This lead him to create the diocese at Hamar, and, according to tradition, to form Cathedral schools in Norway's bishopric cities.