Complex sentence: The one-dollar bill has the oldest design of all U.S. currency currently being producehe design seen today debuted in 1963 when it was first issued as a Federal Reserve Note (previously, one dollar bills were Silver Certificates).
Split into simpler sentences: The one-dollar bill has the oldest design of all U.S. currency currently being produced. The design seen today debuted in 1963 when it was first issued as a Federal Reserve Note (previously, one dollar bills were Silver Certificates).