I NEVER put a whole can of tinned tomatoes into a curry, no matter WHAT the recipe suggests, as it seems there is always FAR too much liquid.
I put them in a bowl and use a potato-masher to break them down slightly but not nearly to passata levels! Then I tip them into a sieve and quickly place that on top of the bowl. Sure, you lose a tiny amount of liquid in the process, but it doesn't matter. Then add just the tomatoes to the recipe and only as much of the tomato-juice as you think it NEEDS. You can always add more later if required.
I can't see much point in adding loads of water or other liquid and then spending ages watching it reduce.