Complex sentence: The Federally-issued greenbacks were gradually supposed to be eliminated in favor of national bank notes after the Specie Payment Resumption Act of 1875 was passed-however, the elimination of the greenbacks was suspended in 1878 and the notes remained in circulation.
Split into simpler sentences: The federally-issued greenbacks were gradually supposed to be eliminated in favor of national bank notes after the Specie Payment Resumption Act of 1875 was passed. However, the elimination of the greenbacks was suspended in 1878 and the notes remained in circulation.