Combine the following simple sentences into one sentence:
Dr. Prabhat Kumar is a retired IAS. He has been appointed chairman of the Uttar Pradesh Public Service Commission.
1
Dr. Prabhat Kumar, a retired IAS, has been appointed chairman of the Uttar Pradesh Public Service Commission.
2
Having been appoint chairman of the Uttar Pradesh Public Service Commission, Dr. Prabhat Kumar is a retired IAS.
3
Dr. Prabhat Kumar, who was a retired IAS, has been appointed chairman of the Uttar Pradesh Public Service Commission.
4
Both 1) and 3).