Beginner Gardening: sansevieria root system isn't improving, 2 by xxkarmaxx

xxkarmaxx wrote:
My mother inlaw gave me this plant along with several others she's had for years and she was neglecting. This one was actually her mother's and is close to 30 years old. It was huge a few years ago and due to her loss of interest in her plants fell into a rather quick decline.

The stalks which were brown and splitting when I received it have seemed to regain some life, however my main concern is the root system. I have had it for about 6 months now and I have it in cactus mix, as well as a clay pot. I only water when the soil feels dry, but the root system doesn't seem to be recovering, the stalks are growing, but they fall over, uprootring themselves frequently. I know they prefer only a little water, hate wet feet and don't require much fertilizer and I know it's way better than before I got it, but...

What more can I do to get this old plant back into a thouroughly healthy condition?