Complex sentence: In the late-1990s, Daugherty became a freelance investigative journalist, during which time she achieved national notoriety for a series of articles exposing severe environmental violations at the Shintech chemical plant in Convent, Louisiana.
Split into simpler sentences: In the late-1990s, Daugherty became a freelance investigative journalist. During this time, she achieved notoriety for a series of articles that exposed severe environmental violations at the Shintech chemical plant in Convent, Louisiana.