He informed me — i.e., gave me understanding (as Daniel 9:2; Daniel 8:16). The angel gave Daniel understanding in the perplexing words of Jeremiah, showing him that what affected his people was a period of seventy weeks that were yet to come, rather than seventy years which were already passed.
Related Commentaries of Daniel 9:22
Daniel 9:22
22 And he informed me, and talked with me, and said, O Daniel, I am now come forth to give thee skill and understanding.