This refers to the beginning of the reign of King Cyrus and records when the first Jews returned from Persia to Judea. Upon return to Judea, the focus of the rest of the Old Testament is on the Jewish people.
"Yahweh ... made Cyrus want to act". King Cyrus allowed them to return because he wanted them to rebuild the temple. Those who stayed behind gave gifts to those who left to help them on their journey and resettlement, which was a way to maintain peace throughout his kingdom.