When Herod hears about Jesus's miracles, he worries, thinking that someone has raised John the Baptist from the dead. (Herod had caused John the Baptist to be killed.)
Some people were saying that Jesus was John the Baptist. This can be stated more clearly. Alternate translation: "Some were saying, 'He is John the Baptist, who has been" (See: [[rc://en/ta/man/translate/figs-explicit]])
"Raised" here is an idiom for "caused to live again." This can be stated in active form. Alternate translation: "John the Baptist has been caused to live again" or "God has caused John the Baptist to live again" (See: [[rc://en/ta/man/translate/figs-activepassive]] and [[rc://en/ta/man/translate/figs-idiom]])