I have received a cactus that is a bit curvy. Here's some pictures to give you an idea:
It's doing well right now but I'm concerned that the curve will eventually break it. Is it possible to cut this into segments and pot them separately?
Very much so. I have done similar cuts many times on cacti and succulents. If you cleanly cut off the top 6 inches or so and pot it up it should root quite easily. And then remove all but the bottom 6 inches and leave it to regrow and you will have two lovely cacti!