Hi Dzemo.
How many vertices are in each of the object? Also, what kinds of errors are you seeing in POV-Ray?
The only "quick and easy" thing you can do to reduce the existing vertex count in an AC3D object is to perform an "Object -> Reduce...". Unfortunately, for a model like this that will end up being the centerpiece of your scene, I doubt you will be happy with the results that gives you. I'd still give it a shot, however - experiment with the reduction amount and see if you get acceptable results. I've gotten some good results using this tool, but it can be hit and miss.
Beyond that, the only options I can think of are combining surfaces and deleting vertices, or recreating the object at a lower polygon level.
Combining the surfaces entails selecting adjacent surfaces and performing a "Surface -> Combine". When you combine surfaces to where some vertices are no longer needed, you can delete those vertices. It's a tedious process, however.
Recreating the object may also seem daunting, but that may be less painful than doing the surface-combining operation. Since you've built it once, a rebuild should take significantly less time. I've rebuilt models in the past because of bad polygon flows or too many vertices, and it helped hone my 3D modeling skills in the process.
Hopefully, though, there may be something you can do in POV-Ray to get things working with the models as they are. I have almost no knowledge in the workings of POV-Ray, but perhaps if you post the error you're getting someone may have some insight? Unless POV-Ray outright says "too many vertices", that is
.