Thank you so much!! And I have another question? Is is natural if I insert 'can' in the sentence? I'm not sure that "..paper on data,which made me think that symbolic data can be used to draw more valid conclusions about our complex world." is natural regarding tense agreement.

It is not proper in that a missing word or phrase (can, may, might, could, should, needs to, theoretically could, could possibly, could probably, etc.) be placed after “data.” As currently written, it reads awkwardly and makes no sense. I hope tgis helps you. J.