A body in an advanced stage of decomposition

[Bassim]

I am wondering if my sentences are grammatically correct.

A body in an advanced stage of decomposition found in the woods is conformed to be a young man who disappeared from his home a few weeks before. As there are no traces of violence on it and no other DNA, the police are still unable to determine the cause of his death.

 

[Rover_KE]

'... is confirmed to be that of a young man ...'

 

[GoesStation]

The present perfect has been would be more natural in the first sentence.

 

[emsr2d2]

I'd probably start with either "A body in the advanced stages of decomposition" or "A body in an advanced state of decomposition". I'd say "... has been confirmed to be that of a young man". The body itself isn't the young man. It's the corpse of that young man.
I'd use "the cause of death" at the end; "his" is unnecessary. "cause of death" is a set phrase.

 

[Bassim]

I will repeat my sentence as an exercise.

A body in the advanced stages of decomposition found in the woods has been confirmed to be that of a young man who disappeared from his home a few weeks before. As there are no traces of violence on it and no other DNA, the police are still unable to determine the cause of death.

 

[emsr2d2]

I'd use "ago", not "before". The piece appears to be written in the present. If it used "had been found/was" and "had disappeared" instead of "has been found" and "disappeared", "before" would be appropriate (although I'd use "earlier").

 

[Roman55]

I agree that the piece appears to be written in the present. As a result, I would remove 'still' from the last sentence or change the sentence to something like, '...the police are as yet unable to determine the cause of death'.