Question: John W. Sidgmore, became the Chief Executive Officer of UUNET Technologies in June 1994, Sidgmore worked to revive WorldCom after disgraced CEO Bernard Ebbers, a Canadian businessman, that co-founded which telecommunications company?
Sentence (from "John W. Sidgmore"): Sidgmore worked to revive WorldCom after disgraced CEO Bernard Ebbers left.
Relevant evidence: Yes