Verse 44 gives background information about how Judas had arranged with the Jewish leaders to betray Jesus. (See: [[rc://en/ta/man/translate/writing-background]])
# Now his betrayer
This refers to Judas.
# he is the one
Here "the one" refers to the man that Judas was going to identify. AT: "he is the one you want" (See: [[rc://en/ta/man/translate/figs-explicit]])
These two phrases have the same meaning to emphasize that they seized Jesus. AT: "grabbed Jesus and seized him" or "seized him" (See: [[rc://en/ta/man/translate/figs-parallelism]])