Complex sentence: While still detached stateside during his convalescence, he visited family and travelled to Washington D.C. In late August, he accepted a speaking engagement at the U.S. Naval Academy at Annapolis.
Split into simpler sentences: While still detached stateside during his convalescence, he traveled stateside and visited family. He travelled to Washington D.C. in late August and while there, accepted a speaking engagement at the Naval Academy at Annapolis.