Complex sentence: Karl Gottlieb Guichard (1724--1775), soldier and military writer, known as Quintus Icilius, was born at Magdeburg, Duchy of Magdeburg, to a family of French refugees.
Split into simpler sentences: Karl Gottlieb Guichard (1724--1775) also known as Quintus Icilius, was a soldier and military writer. He was born at Magdeburg, Duchy of Magdeburg, to a family of French refugees.