YOU SAID:

once on a time someone killed a human with a trained canine killing machine

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かつて誰かが訓練された犬の殺害機械で人間を殺した

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Once someone killed a human with a trained dog killing machine

INTO JAPANESE

誰かが訓練された犬の殺害機械で人間を殺したら

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If someone kills a human with a trained dog killing machine

INTO JAPANESE

誰かが訓練された犬の殺害機械で人間を殺した場合

BACK INTO ENGLISH

If someone kills a human with a trained dog killing machine