Complex sentence: The force gathered at Camden Station at 8:30 AM on July 29 included 250 federal troops, 250 men of the 5th Maryland Regiment, and 260 policemen, and under this guard freight once again resumed traffic in and out of Baltimore.
Split into simpler sentences: The force gathered at Camden Station at 8:30 AM on July 29 included 250 federal troops, 250 men of the 5th Maryland Regiment, and 260 policemen. Under this guard freight once again resumed traffic in and out of Baltimore.