insurance

Hello everyone
please please help me
I need an emergency help

I wanna write a work experience reference letter for an employee
in her first position in the company she was working without insurance benefits* for long time ,after that time she quit from work and she came back last year and she has been working *with insurance benefits from last year

how should I say ..from date1 to date2 she she was working in position A without insurance and from date 3 to now she has been working in position B with insurance

I would be grateful if you help me .thanks