Complex sentence: Bumpus died of a heart attack at age 58 on February 3,2004 while on an airline flight from New York to California, where he was scheduled to perform at the Columbia College Jazz Concert Series.
Split into simpler sentences: Bumpus died of a heart attack on February 3,2004 while on an airline flight. Bumpus suffered a heart attack during a flight from New York to California, where he was scheduled to perform at the Columbia College Jazz Concert Series.