Which is not. Switch language to language and the limits of language, or to change the language to make it easier to understand conversations. May have to switch languages.
That does not alter the language as language constraints and problems of using that language, or to change the language in order to make the discussion easier to understand may have a relay language.
which is not a substitute for the language limitations of language and the use of language, or the language change in order to make the conversation is easy to understand there may be language switching.