Complex sentence: Jessica Whitney Dubroff (May 5,1988--April 11,1996) was a seven-year-old child-pilot trainee who died while attempting to become the youngest person to fly a light utility aircraft across the United States.
Split into simpler sentences: Jessica Whitney Dubroff (May 5,1988--April 11,1996) was a seven year old child. Who died while attempting to become the youngest person to fly a light utility aircraft across the United States.