# Then it happened
This marks the beginning of a new message.
# in the twelfth year
Possible meanings are: this happened in the twelfth year after the Babylonians took the Israelites to Babylon or this happened in the twelfth year after the Babylonians took Jehoiachin to Babylon.
# the word of Yahweh came
"Yahweh spoke this message". This introduces something that God told his prophets or his people. See Ezekiel 3:16.