To understand this [partial] sentence, let's first parse the sentence and eliminate non-vital phrases: "... urging the special congressional committee formed in the debt-ceiling deal this month to identify even more savings than the $1.5 trillion it has been tasked with finding." The phrase "formed in the debt-ceiling deal this month" modifies the noun "the special congressional committee" and can be removed without changing the sentence's main meaning: "... urging the special congressional committee to identify even more savings than the $1.5 trillion it has been tasked with finding." Next, notice that the use of the "more than" phrase, which means that the sentence is making a comparison. In this case, the noun "savings" is inserted right in the middle of the "more than" phrase. Consider the following example: "This is more food than I can eat." The above sentence can be re-organized as: "This food is more than I can eat." In both cases, there is a comparison between (a) this amount of food available and (b) the amount of food that I can eat. In your example, therefore, the sentence makes a comparison between (a) the amount of savings it has been tasked with finding and (b) the amount of savings that hope to be identified. So, the special congressional committee has been tasked with finding $1.5 trillion in savings, but it is hoped that the committee can find savings beyond its original target.