I tried playing around with NLG a couple of years ago. The only tool I was able to get up and running well enough to do anything was SimpleNLG[1]. It's java, not my forte, but was straightforward otherwise. Here's a basic example of use: https://github.com/simplenlg/simplenlg/wiki/Section%20V%20%E...

[1]https://github.com/simplenlg/simplenlg