Hello, thedaffodils. The text is not clear about what they mean by "its," but I can tell what they want.
The first sentence says that some people want a new language to be invented so that people from different languages can communicate with each other using the new language. (Think of languages such as Esperanto.)
The second sentence assumes that making this new language is a good idea. It is asking you to defend the idea. You should think about the advantages (the ways in which it would be helpful) and the disadvantages (the ways in which it would be harmful). Then you should say how and why the advantages are more important than the disadvantages.

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