Complex sentence: He already knew the supreme commander, Erich von Falkenhayn, as well as the chief of operations and other members of the staff, while the Kaiser remembered him as "the fencing lieutenant in Berlin".
Split into simpler sentences: He already knew the supreme commander, Erich von Falkenhayn, as well as the chief of operations and other members of the staff. The Kaiser remembered him as "the fencing lieutenant in Berlin".