Complex sentence: Southern Railway, a predecessor of Norfolk Southern, initially opted out of Amtrak in 1971, although after May 1,1971, Amtrak, assuming the services of the Penn Central, carried the "Southern Crescent" between New York and Washington.
Split into simpler sentences: Southern Railway, a predecessor of Norfolk Southern, initially opted out of Amtrak in 1971. After May 1,1971, Amtrak, assuming the services of the Penn Central, carried the "Southern Crescent" between New York and Washington.