Complex sentence: Perhaps the most well-known German to support the Patriot cause was Friedrich Wilhelm von Steuben from Prussia, who came to America independently, through France, and served under George Washington as inspector general.
Split into simpler sentences: Perhaps the most well-known German to support the Patriot cause was Friedrich Wilhelm von Steuben from Prussia. Von Steuben came to the United States independently, through France, and served under George Washington as inspector general.