Complex sentence: On January 14,1875, Grant signed the Specie Payment Resumption Act into law, which required gradual reduction of the number of greenbacks allowed to circulate and declared that specie payment (i.e., in gold or silver) would resume in 1879.
Split into simpler sentences: On January 14,1875, Grant signed the Specie Payment Resumption Act into law. The Resumption Act required gradual reduction of the amount of greenbacks allowed to circulate and declared that specie payment (i.e., in gold or silver) would resume in 1879.