Complex sentence: Plans for high speed rail date back to the High Speed Ground Transportation Act of 1965, in 2012, Amtrak proposed a $151 billion plan to build its first dedicated high speed rail line by 2040.
Split into simpler sentences: Plans for high speed rail in the U.S. date back to the High Speed Ground Transportation Act of 1965. In 2012, Amtrak made a $151 billion proposal to build its first dedicated high speed rail line by 2040.