Sentence Correction (SC) | Re: The rare bird, considered extinct for over fifty years and

The rare bird, considered extinct for over fifty years and actually thriving in a remote part of the Andes, has made a remarkable comeback over the past decade.

1 The rare bird, considered extinct for fifty years and actually thriving in a remote part of the Andes, has made a remarkable comeback over the past decade.
2 The rare bird, which had been considered extinct for over fifty years but it was actually thriving in a remote part of the Andes, has made a remarkable comeback over the past decade.
3