As I understand, the original is not clear on whether: 1) Any one who seeks to use his blood, must first ask his permission. 2) Donating his blood automatically

As I understand, the original is not clear on whether: 1) Any one who seeks to use his blood, must first ask his permission. 2) Donating his blood automatically makes it available to whoever needs it. I think your rewording still leaves that ambiguity, somewhat (though it does seem better), because i keep reading that as: > he must allow it to be used.. Perhaps it would have been best to right it to break it down into two sentences. He can donate blood for himself. If someone needs it, they have to ask for his permission. or He can donate blood for himself, but then this makes it accessible to whoever is in need of it.