Complex sentence: They hired as agent a multilingual young physician from the Electorate of Hanover, Justus Erich Bollmann, who acquired an assistant, a South Carolinian medical student named Francis Kinloch Huger, son of Benjamin Huger, whom Lafayette had stayed with upon his first arrival in America.
Split into simpler sentences: They hired as agent a young Hanoverian physician, Justus Erich Bollmann, who acquired an assistant, a South Carolinian medical student named Francis Kinloch Huger. This was the son of Benjamin Huger, whom Lafayette had stayed with upon his first arrival in America.