Complex sentence: Mažuranić served as Ban of Kingdom of Croatia-Slavonia between 1873 and 1880, and since he was the first ban not to hail from old nobility, he was known as "Ban pučanin" (Ban commoner).
Split into simpler sentences: Mažuranić served as Ban of Kingdom of Croatia-Slavonia between 1873 and 1880. He was the first Croatian ban not to hail from old nobility so he was known as "Ban pučanin" (Ban commoner).