It's just adding the words, “while using reasonable efforts to minimize any benefit to terrorist groups.”
The whole thing would read:
(4) Subsections (1) and (2) do not apply to a person who carries out any of the acts referred to in those subsections for the sole purpose of carrying out humanitarian assistance activities conducted under the auspices of impartial humanitarian organizations in accordance with international humanitarian law while using reasonable efforts to minimize any benefit to terrorist groups.