The first thing that the oppressive nobles promise (publicly!) is, We will restore these.
The pronoun these
refers to the fields, vineyards, orchards, and houses Nehemiah had listed in the previous verse.
The second thing they pledge to do is require nothing from them.
The pronoun them
refers to the people on whom they had laid a burden as they provided money, grain, wine, and oil
(including taking their children). The phrase require nothing
includes the return of the children. It expresses the opposite of the morally unacceptable expectation reflected in our translation by the concept of exacting interest.
They summarize it all in their concluding statement, We will do as you say.
Again, it’s a word spoken to Nehemiah in the hearing of the crowd. We can well imagine the collective sigh of relief!
12 Then they said, “We will restore these and require nothing from them. We will do as you say.” And I called the priests and made them swear to do as they had promised.