To improve my business language

I've been m an hse HSE expert since for several (or many years, or specify the number) years in a number(I changed this from several so I didn't repeat the word) several because  of different companies namely including in agro, industrial, business and pharmaceutical  groups. , industrial and pharmaceutical ones. I have managed teams spread accross several different sites in france. Thanks

To improve my business language

I'm an hse expert since years in several companies namely in agro business groups, industrial and pharmaceutical ones. I have managed teams spread accross different sites in france. Thanks

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To improve my business language (or business English)

Hi. Those are my first words on this forum.  I will start (or begin) a new job in several days and want (or would like) to improve my business English.  Is it correct and pertinent if I say this to introduce myself:  (I agree with Andrew that "pertinent" sounds a bit off; you might simply write "Is it correct if I say this to introduce myself.")

I've been an HSE expert for _x_ years (fill in the number of years), working for companies in agricultural, industrial, and pharmaceutical settings.  I have managed teams at different sites throughout France.

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This is my first correction for anyone, so I'm not sure how it is done.

Kind regards.