"The case was reopened about a fortnight after it was dropped(,) by a chief prosecutor. Who had gone on record, saying there's no reason to suspect he'd committed rape."
Taken from an internet debate. Please ignore the actual debate itself, it's about JA. There is a dispute in the meaning of the statement.
If you were to read this, would you assume that it was
a) the chief prosecutor had reopened the case
b) the chief prosecutor had dropped the case.
Who would you think had gone on record to state there's no reason etc. The chief prosecutor or the other?
Does your answer change with/without the "," in brackets?