en_tn/luk/03/18.md

with many other exhortations

This could be translated as "with many other strong urgings" or "John encouraged the people many times to repent and..."

rebuked Herod the tetrarch

"told Herod the tetrarch that he had sinned." Herod was a tetrarch, not a king. He had only limited rule over the region of Galilee.

for marrying his brother's wife

"because Herod married his own brother's wife"

he had John locked up in prison

"he told his soldiers to put John in jail"