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Villain to Goku in Dragon Ball (Chapter 2), translated as: "If you leave the turtle, I'll spare your lives".
かめをおいていけば = If you leave behind the turtle
命を助けてやる = I'll save your lives for you
といってる = He is saying
ん = nominalizer
だが = however
I can't understand why the reported speech and why there's a だが at the end.
May be he is saying: "Although they say that" in a figurative way?
With a bit more context, he is saying
ははー
ボウズ！！
その海【うみ】ガメ
オレさまに
よこさんか？[...]
カメを
おいていけば
命【いのち】を助けて【たすけて】やると
いってるんだが・・・まさか
さからおうっ
てんじゃ
ないだろ？
So here といってる is used to cite his previous sentence (where he already asked them to hand over the turtle) and が is used with its usual meaning of "but" (and could for example be substituted by けど here).
So a semi-literal translation might be something like
Hey, I'm saying I'll let you live if you hand over the turtle, but... you're not actually going to go against what I said, are you?
