Could you check this out?

Bilateral aid is a transfer directly from one goverment to another. Mutilateral Programs, on the other hand, are those by which aid is channeled from several nations through international or regional organizations.

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Could I rewrite the second sentence like "Mutilateral Programs, on the other hand, are those (that) aid is channeled from several nations through international or regional organizations by which."?

Please check it out.

Thanks.