Complex sentence: In 1936, he added Lionel Hampton on vibes to form the Benny Goodman Quartet; in 1939 he added pioneering jazz guitarist Charlie Christian to his band and small ensembles, who played with him until his death from tuberculosis less than three years later.
Split into simpler sentences: In 1936, he added Lionel Hampton on vibes to form the Benny Goodman Quartet. Christian played with him until his death from tuberculosis less than three years later.