Complex sentence: Congress became concerned that air transport in the long run might follow the nation's railroads into trouble; in 1970 the Penn Central Railroad had collapsed in what was then the largest bankruptcy in history, resulting in a huge taxpayer bailout in 1976.
Split into simpler sentences: Congress became concerned that air transport in the long run might follow the nation's railroads into trouble. In 1970 the Penn Central Railroad had collapsed in what was then the largest bankruptcy in history, resulting in a huge taxpayer bailout in 1976.