Complex sentence: Robert E. Lee, of the Confederate States of America in the predicted that the south's non-connecting railroads would cause problems for the military and was proven correct when two locomotives had to be hauled over land around Alexandria during the American Civil War.
Split into simpler sentences: Robert E. Lee, of the Confederate States of America in the predicted that the south's non-connecting railroads would cause problems for the military. He was proven correct when two locomotives had to be hauled over land around Alexandria during the American Civil War.