I have just brought a staff from a mate of mine he is about 2-3 year old and I am trying to introduce him to my two kittens but he keeps going for them, is there any way I can stop this from happening so I don't wake up to 2 dead kittens?

Yes, re-home the kittens, or re-home the staffy. It will not work, between them.

Is there truly no way of teaching him as I don't really want to get rid of either??

You can't have it both ways, and you can't always be around to watch everyone and keep them safe.
Some dogs just don't like cats, some dogs don't like other dogs, that doesn't usually change.
In order to keep the kittens safe rehoming one or the other is the only sure way.
Just my opinion, but I would not take chances with living beings.