Complex sentence: There was one close targeted fly-by during the primary mission, at a distance of 500 km on November 26,2005, with another flyby at a distance of 5,750 km on August 30,2007.
Split into simpler sentences: There was one close targeted fly-by during the primary mission, at a distance of 500 km on November 26,2005. An additional close flyby at a distance of 5,750 km was performed on August 30,2007.