His mother told Jim

[Bassim]

Would you please correct the mistakes in my sentence?

His mother told Jim he was ungrateful because he didn't appreciate how well off they were.

 

[Rover_KE]

It's OK, but it's more common to start 'Jim's mother told him ...'

 

[teechar]

To avoid potential ambiguities, try:
Jim's mother told Jim (that) he was ungrateful and that he didn't appreciate how well off they were.
[Wow, Rover, that's a Guinness World Records snap! ]