Could anyone correct my mistake?

Question

To whome it may concern
This is to certify that Eng., Alan K seranny an Egyptian nationality worked as ( Computer Trainner ) from 3 – 9 – 2003 to 23 – 8 – 2013 as a Computer and Electronics Trainner and Maintenance.
During his service with us, we found him to be a very hard working, sincere in his duties given to him efficiently.
We give him this certificate according to his need.

We wish all the best in his future life.

Answer 1

"we found him to be a very hard working employee, sincere in the duties given to him efficiently"

The rest is perfect great job hope it helped :)

Answer 2

To whom it may concern:



This is to confirm that Eng. Alan K. Seranny, an Egyptian national, worked for us from 3 September 2003 to 23 August 2013 as a Computer and Electronics Trainer and maintenance specialist.



During his service with us, we found him to be hard working and sincere in his duties, which he accomplished efficiently.



We wish all the best in his future life.

Answer 3

This appears to be an attempt at fraud, which I will have no part