Complex sentence: While in Washington, the chief also met with the Marquis de Lafayette, who was also visiting Washington, D.C. for the last time, and hailed him as a fellow aged warrior who, though foreign, rose to high renown in the American cause.
Split into simpler sentences: While in Washington, the chief also met with the Marquis de Lafayette, who was visiting Washington, D.C. for the last time. He hailed Lafayette as a fellow aged warrior who, though foreign, rose to high renown in the American cause.