The rulebook states that you choose one weapon to use, and ignore the other (some people would even argue that, by RAW, this technically means you can never get +1 attack for two weapons - but they realise that just means that the rules are somewhat busted). So in the case of having both Rending Claws and Boneswords, you choose one, and all your attacks are counted as being made with that weapon. If you choose Bone Swords, it's AP3 and Lifedrain. If you choose Rending Claws then your attacks all have Rending, but no AP3 and no Lifedrain.
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