Complex sentence: As the Mint tried to relieve the coin shortage, its minting operations were rapidly depleting the Treasury's stock of silver, a metal whose price was rising to such an extent that by early June a dime contained 9.33 cents worth of silver at market prices.
Split into simpler sentences: As the Mint tried to relieve the coin shortage, its minting operations were rapidly depleting the Treasury's stock of silver. Prices for that metal were rising to such an extent that by early June a dime contained 9.33 cents worth of silver at market prices.