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They need more water. Probably once a month thereabouts. When you water, water till the excess runs through the bottom drainage holes. Then don't water again till the soil is dry. Here is more info:

https://www.gardeningknowhow.com/houseplants/snake-plant/snake-plant-care.htm

I don't see anything wrong with that plant at all! Twisting is natural, or could indicate a slight pH imbalance, but that will not be detrimental to this easy going, hard-to-kill plant.

Thrips will cause major damage to your plant very fast. You will see damage, insect feces, and long thin insects on your plant, making it very visible. If you have thrips there will be no question about it. It will be VERY evident. They tend to make themselves known since they kill plants extraordinarily quick.

This article will help you with snake plant care: https://www.gardeningknowhow.com/houseplants/snake-plant/snake-plant-care.htm

These will prefer to root in mostly dry, to dry soil. They are quite easygoing, as long as you don't overwater them. This is what will usually kill them.

These articles will help: https://www.gardeningknowhow.com/houseplants/snake-plant/snake-plant-propagation.htm

It appears that it has been slightly overwatered, or the root area has remained wet for too long. If this is a new transplant, then it is best to only transplant into a container that is an inch or two bigger on all sides to avoid overwatering. This is especially true with the Snake plant. They are very drought tolerant, but not very tolerant of wet feet.

This article will help you to care for these plants: https://www.gardeningknowhow.com/houseplants/snake-plant/snake-plant-care.htm

I would definitely say overwatering. You won't be able to go by any set time frame to water (like twice a month, twice per week, etc) since the soil will take different lengths of time to dry out depending on conditions.

These are very drought tolerant, and will need to dry out VERY thoroughly between watering. Make sure that this is dry almost down to the very bottom of the container before watering again. Make sure to only water until the water start to leak out of the drain hole, then let all extra water out of the container. If this is a container with no drainage, then you will have to lift the pot when it is completely dry, and completely saturated. When it reaches dry weight, water then drain any extra out of container. Or purchase a moisture meter that can reach to the bottom of the container.

You will want to treat with a fungicide. This article will help: https://www.gardeningknowhow.com/garden-how-to/info/using-fungicides-in-garden.htm

This article will help you to care for the plant: https://www.gardeningknowhow.com/houseplants/snake-plant/snake-plant-care.htm

Yes, it could be low humidity, but none of the plant care articles I referenced said snake plants needed humidity. Have you cut back on water for winter dormancy?
Splitting can also be due to mechanical injury.

You can remove the damaged leaves at the base of the plant.

Here is more:

https://www.gardeningknowhow.com/houseplants/hpgen/houseplant-leaf-split.htm

https://www.gardeningknowhow.com/houseplants/snake-plant/snake-plant-care.htm