What does 2 Chronicles 36:21 mean?

All this happened to fulfill what the Lord had said through Jeremiah: The land would finally get its rest, lying empty for seventy years, making up for all the Sabbaths it had missed. 2 Chronicles 36:21 - Modern Text Bible

(The exile fulfilled Jeremiah's prophecy, giving the land its long-overdue rest for seventy years, as a consequence of the people's disobedience.)