When Herod hears about Jesus' miracles, he worries, thinking that someone has raised John the Baptist from the dead. (Herod had caused John the Baptist to be killed.)
# King Herod heard this
The word "this" refers to everything that Jesus and his disciples had been doing in various towns, including casting out demons and healing people.
Some people were saying that Jesus was John the Baptist. This can be stated more clearly. AT: "Some were saying, 'He is John the Baptist who has been" (See: [[rc://en/ta/man/translate/figs-explicit]])
It may be helpful to state why some people thought he was Elijah. AT: "Some others said, 'He is Elijah, whom God promised to send back again.'" (See: [[rc://en/ta/man/translate/figs-explicit]])