Complex sentence: Dunn worked as a federal employee for the U.S. Agricultural Extension Service 4-H agent in Grainger County, Tennessee for approximately eight years where he reportedly received several awards for his work in 4-H youth development.
Split into simpler sentences: Dunn worked as a federal employee for the U.S. Agricultural Extension Service as a 4-H agent in Grainger County, Tennessee for approximately eight years. Dunn reportedly received several awards for his work in 4-H youth development.