to prevent anymore thieves from stealing

[theol]

After things got stolen by a thief. The store owner put more locks to prevent anymore thieves from stealing things in his store.

Are there any mistakes in the sentences?

 

[5jj]

After things got stolen by a thief. The store owner put more locks to prevent anymore thieves from stealing things in his store.

After some things were stolen, the store owner installed more locks.

You don't need the parts I have underlined.

 

[emsr2d2]

You have written two sentences where there should be only one. 5jj's version correctly uses a comma instead of your full stop.