YOU SAID:
He mentioned he had a matter of importance to discuss with you.
INTO JAPANESE
彼はあなたと議論する重要な問題を持っていたと述べた。
BACK INTO ENGLISH
He said he had an important matter to discuss with you.
INTO JAPANESE
彼はあなたと議論する重要な問題だと述べた。
BACK INTO ENGLISH
He said an important matter to discuss with you.
INTO JAPANESE
あなたと議論する重要な問題と述べた。
BACK INTO ENGLISH
I discussed important issues to discuss with you.
INTO JAPANESE
私はあなたと議論する重要な問題を議論しました。
BACK INTO ENGLISH
I discussed important issues to discuss with you.
That didn't even make that much sense in English.