Complex sentence: From 1976 to'82, he was on the editorial staff of "The New Yorker" magazine; for the final three years of the novelist Bernard Malamud's life (1983--86) Dunn was his literary assistant.
Split into simpler sentences: From 1976 to'82, he was on the editorial staff of "The New Yorker" magazine. For the final three years of the novelist Bernard Malamud's life (1983--86) Dunn was his literary assistant.