Complex sentence: In 2005, the National Park Service decided to moved volunteers from the Texas Eagle to the Empire Builder; between 2005 and 2010, volunteers presented interpretive programs between Chicago Union Station and either Winona, Minnesota or St. Paul, Minnesota.
Split into simpler sentences: In 2005, the National Park Service decided to move volunteers to the Empire Builder. Between 2005 and 2010, volunteers presented interpretive programs between Chicago Union Station and either Winona, Minnesota or St. Paul, Minnesota.