Complex sentence: He told Sheridan and Delenn that he had never expected to live that long--he had been sure for a long time that his tenure on Babylon 5 would end with him face down somewhere in Brown Sector.
Split into simpler sentences: He told Sheridan and Delenn that he had never expected to live that long. Garibaldi had been sure for a long time that his tenure on Babylon 5 would end with him face down somewhere in Brown Sector.