I had to look this up. The simplified publication is called "What Can the Bible Teach Us?"
Here is the section in the back of the book.
In retrospect, it so full of holes I can't believe I ever bought any of this.
22 WHY IS
THE YEAR 1914 SO IMPORTANT?
The prophecy in Daniel chapter 4 teaches
us that God would set
up his Kingdom in 1914.
gave King Nebuchadnezzar a prophetic dream about a large tree that was chopped
down. In the dream, a band of iron and copper was put around the tree’s stump
to stop it from growing for a period of “seven times.” After that, the tree
would grow again.—Daniel 4:1, 10-16.
the prophecy means for us: The
tree represents God’s rulership. For many years, Jehovah used kings in
Jerusalem to rule over the nation of Israel. (1 Chronicles 29:23) But those kings became
unfaithful, and their rulership ended. Jerusalem was destroyed in the year
607 B.C.E. That was the start of the “seven times.” (2 Kings 25:1, 8-10; Ezekiel 21:25-27)
When Jesus said, “Jerusalem will be trampled on by the nations until the
appointed times of the nations are fulfilled,” he was talking about the “seven
times.” (Luke 21:24) So the “seven times” did not end when Jesus
was on earth. Jehovah promised to appoint a King at the end of the “seven
times.” The rulership of this new King, Jesus, would bring great blessings for
God’s people all over the earth, forever.—Luke 1:30-33.
length of the “seven times”: The
“seven times” lasted for 2,520 years. If we count 2,520 years from the year
607 B.C.E., we end up at the year 1914. That was when Jehovah made Jesus,
the Messiah, King of God’s Kingdom in heaven.
How do we get the number
2,520? The Bible says that three and a half times equal 1,260 days. (Revelation 12:6, 14) So “seven times” is double that number, or
2,520 days. The 2,520 days are equal to 2,520 years because of the prophetic
rule “a day for a year.”—Numbers 14:34; Ezekiel 4:6.
▸ Chap. 8, par. 23