Original sentence: He also investigated the political dealings of Chicago's Dan Rostenkowski in the 1990s.He has worked as a reporter at Chicago Today (1973–1974), the Chicago Tribune (1976–1983), the Chicago Sun-Times (1983–2001), the Los Angeles Times (2001–2008), and the Washington Times (from April 2009)
Edited sentence: He also was a prominent investigator of the political dealings of Chicago's Dan Rostenkowski in the 1990s.He has worked as an investigative reporter at Chicago Today (1973–1974), the Chicago Tribune (1976–1983), the Chicago Sun-Times (1983–2001), the Los Angeles Times (2001–2008), and the Washington Times (from April 2009)