Today's Resources The ancient swamps, reefs, and rivers have been gone for hundreds of millions of years, and we are now exploiting their deposits.
(Today's Resources The ancient swamps, reefs, and rivers; have been gone; T:for hundreds of millions of years) (we; are exploiting; their deposits; T:now)
Today's Resources The ancient swamps, reefs, and rivers we
have been gone are exploiting
T:for hundreds of millions of years
their deposits T:now