What does Daniel 9:2 mean?

in the first year of his reign I, Daniel, understood by the books the number of the years whereof the word of Jehovah came to Jeremiah the prophet, for the accomplishing of the desolations of Jerusalem, even seventy years.

In the first year of his reign I Daniel understood by books the number of the years, whereof the word of the Lord came to Jeremiah the prophet, that he would accomplish seventy years in the desolations of Jerusalem.

in the first year of his reign I, Daniel, understood by the books the number of the years whereof the word of Jehovah came to Jeremiah the prophet, for the accomplishing of the desolations of Jerusalem, even seventy years.

In the first year of his rule, I, Daniel, saw clearly from the books the number of years given by the word of the Lord to the prophet Jeremiah, in which the making waste of Jerusalem was to be complete, that is, seventy years.

in the first year of his reign, I, Daniel, have understood by books the number of the years, (in that a word of Jehovah hath been unto Jeremiah the prophet,) concerning the fulfilling of the wastes of Jerusalem--seventy years;

The first year of his reign I, Daniel, understood by books the number of the years, concerning which the word of the Lord came to Jeremias, the prophet, that seventy years should be accomplished of the desolation of Jerusalem.

in the first year of his reign, I Daniel understood by the books that the number of the years, whereof the word of Jehovah came to Jeremiah the prophet, for the accomplishment of the desolations of Jerusalem, was seventy years.