That doesn't explain why you need a single sensor to do -200 to +200C. That just shows you more likely need a number of different sensors, each tailored to it's own range.
For accuracy: if you're doing say liquid nitrogen, I'd want a sensor that's accurate between -170C to -220C- around the -196C boiling point of the stuff. If that sensor shows a temperature of +20C but is 10C off at that temperature I wouldn't care too much because it's obvious that your nitrogen has evaporated by then and there's nothing to measure anyway.
For the room temperature: use the common DS18B20 or similar. It will also do quite well to measure the temperature at the hot end of an AC compressor.
For the stuff that's normally at high temperature: get a thermocouple.
There are very few applications where you would have a point that goes through that great temperature swings, and where you really need to accurately measure the temperature over that full range.