Complex sentence: From 1526 to 1528 Reusner served as private secretary to the German mercenaries in Italy, their leader Georg von Frundsberg, where he witnessed the Storming of Rome, among other things.
Split into simpler sentences: From 1526 to 1528, he was the private secretary of the captain Georg von Frundsberg to the German mercenaries in Italy. He witnessed the Storming of Rome, among other things.