It is implied that John reproved Herod. This can also be translated with an active form. Alternate translation: "When Herod the tetrarch had been reproved by John" or "When John reproved Herod the tetrarch" (See: [[rc://en/ta/man/translate/figs-explicit]] and [[rc://en/ta/man/translate/figs-activepassive]]))
"because Herod married Herodias, his own brother's wife." This was evil because Herod's brother was still alive. This can be stated clearly. Alternate translation: "because he married his brother's wife, Herodias, while his brother was still alive" (See: [[rc://en/ta/man/translate/figs-explicit]])