The passage does not state the implied fact that Herod was the ruler of Galilee. You could make this information explicit: "Jesus was under the authority of Herod because Herod ruled over Galilee." (See: [[rc://en/ta/man/translate/figs-explicit]])
## he sent ##
<b>he sent <b>- "Pilate sent"
## who himself ##
<b>who himself <b>- This refers to Herod.
## in those days ##
This could be translated as "during the Passover Festival."