Complex sentence: It was there he began a lifelong friendship with another young pilot in the squadron, Manfred von Richthofen; they would later exchange family visits on leave, and Richthofen would later host the Voss family at his squadron's airfield.
Split into simpler sentences: It was there he began a lifelong friendship with another young pilot in the squadron, Manfred von Richthofen. They would later exchange family visits while on leave, and Richthofen would later host the Voss family at his squadron's airfield.