I, M.S., manager of the company mentioned above declares that:
L.M.C., ID card Nº:....... has been working as a waitress in my restaurant, from 1.12.2009 on, with a salary of € 600 plus € 300 as a bonus for tips.
There are still some mistakes. If you don't mind I'll suggest a more "natural" version in English. Tell me if you agree so that I can edit, OK?
I. MARIO SOTERION, manager of the company mentioned above declares that:
LISA-MARIA CAPTIU, ID card Nº:....... has been working as a waitress in my restaurant, from 1.12.2009 on, with a salary of € 600 plus € 300 as a bonus for tips.