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1/ Please correct this sentence:

They will find measures to resolve environment issue and prevent war. Besides, there will be a meeting for solutions to many-side civil war in A. However, many wonder whether there will be able to have statement on each discussed issue or not.

Now, their role has moved to direct intervention into conflicts and the nature of conflicts have also changed rapidly from war among nations to civil war dificult to prevent.

2/ Do you write many-side civil war or many-sided civil war ? What is the difference btw them?

Q
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Just some observations, not a full correction:

>Please correct this sentence:
THESE sentenceS (this is plural)

to THE many-sideD civil war in A
(THE because you're taking about a very specific war)

the nature of conflicts HAS also changed
(the nature is the subject and it's singular)
Comments  
At this conference/summit/meeting, attemps will be made to find measures to resolve environmental issues and to prevent war. Besides, there will be a separate meeting for finding solutions to the many-sided civil war in A. However, many wonder whether there will be a (common) statement on each discussed issue or not.

Presently, their role has changed to direct intervention in conflicts, while the nature of conflicts has also changed rapidly from wars among nations to dificult-to-prevent civil wars.