[Ken ga nani o nusunda no ka] wa wakatte iru ga, [Naomi ga *(nani o) urisabaita no ka] wa wakatte inai.
[Ken nom what acc steal-past nml q] top understand-ger be-pres although [Naomi nom what acc sell-past nml q] top understand-ger be-neg-pres
Although we know what Ken stole, we don't know what Naomi sold.