Complex sentence: After Fort Sumter fell, at the outbreak of the American Civil War, the Galena townspeople held a town meeting; the featured speakers were U.S. Congressman Elihu B. Washburne and Rawlins.
Split into simpler sentences: After Fort Sumter fell, at the outbreak of the American Civil War, the Galena towns people had a town hall meeting. Speaking at the event were U.S. Congressman Elihu B. Washburne and Rawlins.