First, I would say: Somebody failed this examination yesterday. Someone will fail the next examination (also). " Next, I would say: By having built new, comfortable houses, we have (already) improved the living conditions of (many) people.
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But it is also interesting for me...if it correct to write "we improve living conditions" instead of we "have (already) improved"... or I should use Present Perfect anyway as I wrote "having built" before?
By having built new, comfortable houses, we have (already) improved the living conditions of (many) people.