On doit découvrir par où on est arrivé.
'on' means 'we'. 'doit' is third-person singular present indicative of 'devoir' which means 'must, have to' in English. Therefore, 'on doit' means 'we must'.
'découvrir' means 'to discover'. 'on doit découvrir' means 'we must discover' or 'we must find out'.
'par où' means 'through where'.
'on est arrivé' means 'we arrived'.
The sentence means in total 'we must find out where we came through'.
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