The abstract noun "complaint" can be translated as the verb "complain." AT: "I would stop complaining" or "I would stop complaining against God" (See: [[rc://en/ta/man/translate/figs-abstractnouns]])
Job's sad face is spoken of here as if it was something that could be removed. AT: "I would stop looking unhappy and smile" (See: [[rc://en/ta/man/translate/figs-metaphor]])