Complex sentence: Fabiola had agreed to work in the machine shop just out of ambition, however, Ramon unmasked her to Joan, making her accept that she decided to work in the shop, just so they can trust her with life insurance money.
Split into simpler sentences: Fabiola had agreed to work in the machine shop just out of ambition. However, Ramón unmasks her to Juana, making her accept that she decided to work in the shop, just so they can trust her with the insurance money.