Complex sentence: Routine mission operations for "Pioneer 11" were stopped September 30,1995, when it was 6.5 billion km (approx 43.4 AU) from Earth, traveling at about 2.4 AU/year (11.4 km/s).
Split into simpler sentences: Routine mission operations for "Pioneer 11" were stopped September 30,1995, when it was 6.5 billion km (approx 43.4 AU) from Earth. Traveling at about 2.4 AU/year (11.4 km/s).