Here are the sentences with the mistakes underlined and corrected:

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 more **hard**.

4. This week you look more **healthily** than last week.
**Correction:** This week you look more **healthy** 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** crop 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 usual.
**Correction:** I think a **settled** life is **better** than usual.

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

9. The heavy rain makes it more **difficultly** to drive.
**Correction:** The heavy rain makes it more **difficult** to drive.

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

Note: In sentence 10, a more common formulation might be "Their team performed much **better** than our team."