Complex sentence: The M-10000 was as much a publicity tool as a practical train; during 1934 it made a exhibition tour across the United States, visiting Washington, DC, for inspection by Franklin Delano Roosevelt.
Split into simpler sentences: The M-10000 was as much a publicity tool as a practical train. During 1934 it made a exhibition tour across the US, visiting Washington, DC, for inspection by Franklin Delano Roosevelt.