Here are the corrections for each sentence:

1. **Their life has been more comfortably since they moved to the city.**
**Correction:** Their life has been more comfortable since they moved to the city.

2. **She looks more pretty in this white dress.**
**Correction:** She looks prettier in this white dress.

3. **The manager wants us to work more hardly.**
**Correction:** The manager wants us to work harder.

4. **This week you look more healthily than last week.**
**Correction:** This week you look healthier than last week.

5. **Everyone in my town is looking for more better crop this year.**
**Correction:** Everyone in my town is looking for better crops this year.

6. **Jim runs more fast than his friends.**
**Correction:** Jim runs faster than his friends.

7. **I think a settle life is more better than a nomadic life.**
**Correction:** I think a settled life is better than a nomadic life.

8. **Today Jim performs more confident than usual.**
**Correction:** Today Jim performs more confidently than usual.

9. **The heavy rain makes it more difficult to drive.**
**Correction:** The heavy rain makes it more difficult to drive. *(Note: This sentence is already correct, but could be rephrased for clarity: "The heavy rain makes driving more difficult.")*

10. **Their team preformed much more well than our team.**
**Correction:** Their team performed much better than our team.