Complex sentence: They have filed a case with the Court of Arbitration in Lausanne, Switzerland.If stripped of his Medal, Tallent will instead claim Gold, Si, Silver and Heffernan will claim Bronze.
Split into simpler sentences: They have filed a case with the Court of Arbitration in Lausanne, Switzerland. If he is stripped of his medal, Tallent will instead claim Gold, Si, Silver and Heffernan will claim bronze.