Complex sentence: Mariano made it a point to never ask a Filipino, upon meeting them, what province one was from, to him it was irrelevant where in the Philippines one was from-only that you were Filipino.
Split into simpler sentences: Mariano made it a point to never ask a Filipino, upon meeting them, what province one was from in the Philippines. To him it was irrelevant where in the Philippines one was from-only that you were Filipino.