" The second is more natural because we use "the" in so many cases where there is an accompanying relative clause. The sentence as a whole, however, is not particularly idiomatic. We would more likely say He doesn't show much compassion to other people.
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Anonymous"Compassion he shows to other people is not much.""The compassion he shows to other people is not much."The second is more natural because we use "the" in so many cases where there is an accompanying relative clause.