Complex sentence: The Juno II was used for 10 satellite launches, of which six failed, launching Pioneer 3, Pioneer 4, Explorer 7, Explorer 8, and Explorer 11 from Cape Canaveral Air Force Station Launch Complex 5 and Cape Canaveral Air Force Station Launch Complex 26B.
Split into simpler sentences: The Juno II was used for 10 satellite launches, of which six failed. It launched Pioneer 3, Pioneer 4, Explorer 7, Explorer 8, and Explorer 11 from Cape Canaveral Air Force Station Launch Complex 5 and Cape Canaveral Air Force Station Launch Complex 26B.