"because Herod married Herodias, his own brother's wife." This was evil because Herod's brother was still alive. This can be stated clearly. AT: "because he married his brother's wife, Herodias, while his brother was still alive" (See: [[rc://en/ta/man/translate/figs-explicit]])
Because Herod was tetrarch, he probably locked John up by ordering his soldiers to lock John up. AT: "he had his soldiers lock John up in prison" or "he told his soldiers to put John in prison" (See: [[rc://en/ta/man/translate/figs-explicit]])