Complex sentence: In that year, he became fifth president of the University of Michigan, serving until his death at age 50 from angina in February, 1925, following a heart attack in the fall of 1924.
Split into simpler sentences: In that year, he became fifth president of the University of Michigan. Burton served until his death at age 50 from angina in February, 1925, following a heart attack in the fall of 1924.