Complex sentence: Snowden praised the beauty of the coins, and was happy that Barber had required less relief than needed on US coins of like value, since this meant the coins would be easier for the Mint to strike.
Split into simpler sentences: Snowden praised the beauty of the coins, and was happy that Barber had required less relief than needed on US coins of like value. He noted that the fact that the designs were not raised much from the surface of the coin meant the coins would be easier for the Mint to strike.