text: Marcellina has hired Bartolo as her counsel , since Figaro had once promised to marry her if he should default on a loan she had made to him , and she intends to enforce that promise .
simplified: Marcellina has hired Bartolo as her adviser , because Figaro had once promised to marry her if he was not able to pay back some money which she had lent to him , and she wants that promise to come true .