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I wrote a sentence and I think it's grammatically correct but I'm not sure because it's long and I don't know if we can use this phrasal verb like this.

It opens the matter that ...(a full sentence)... up for discussion.

Another example:

These developments opens the matter that technology could be more harmful than we think in the future up for discussion.

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    You don't want a long separation between simplex verb and particle, and it's usually a debate that's opened up. 'It opens up the debate as to whether ...'. – Edwin Ashworth Sep 22 '17 at 10:46
  • Incidentally, I'd advise you to drop the term 'phrasal verb'. It's completely misleading since in, for example, "open up", it's not "open up" that is a verb but just the word "open". – BillJ Sep 22 '17 at 12:02
  • the matter… would need no explanation. It opens the matter (up) for discussion would suffice. When explanation is desirable, use the idea of or the topic of… Try These developments open the idea that in the future, technology could be more harmful than we think up for discussion. – Robbie Goodwin Sep 24 '17 at 17:24
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I wouldn't use the expression 'open sth up for discussion' in the way you are trying to in your examples. It's not only ungrammatical, it's also not the best choice of expression for the meaning I think you want to convey.

English cannot tolerate such a long gap between the beginning and the end of the phrasal verb. If you really want a long noun phrase, you need to re-order your sentence, e.g:

This opens up for discussion the topic/question/etc. of [long noun phrase].

But I think it would be more idiomatic to use a different expression, because 'open up for discussion' is not generally used with an impersonal subject ('It' or 'These developments') but usually only with a real human agent ('he opened the issue up for discussion in the meeting'). So I think you would be better off choosing a different expression, e.g:

These developments raise the issue of/prompt a discussion into/lead to the question of ...

or other suitable expressions.

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