We are writing to advice...

[Ganesh]

We are writing to adviceyou that inaccordance with the policy termand condtions,your free insurance has expired and no longer covered
accordance.......according is this equal to that
no longer.......in future

Ganesh ......i do not know how to go to the gramer section

[Beeesneees]

We are writing to advise you that in accordance with the policy terms and conditions, your free insurance has expired and you are no longer covered by this agreement.

in accordance = conforming with (the details of the policy)
no longer = from the point of expiry onwards

Do you mean this grammar section?
http://www.english-test.net/lessons/index.html
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Cheers m' dears!