Which is the best sentence?
Michelle's supervisor wants to send an announcement to the mailing list, and she is writing it.
Michelle's supervisor wants to send an announcement, which she will write, to her mailing list.
An announcement written by Michelle is wanted by her supervisor to send to
the mailing list.
Michelle's supervisor wants to send an announcement written by Michelle to
her mailing list.
Michelle's supervisor wants to send an announcement to the mailing list, and Michelle is writing it.