Complex sentence: He began his career as a law clerk in the U.S. Court of Appeals for the Third Circuit, then worked at the law firm Sidley Austin in Washington, D.C. for four and a half years.
Split into simpler sentences: He began his career as a law clerk in the U.S. Court of Appeals for the Third Circuit. He then worked at the law firm Sidley Austin in Washington, D.C. for four and a half years.