Complex sentence: Howard Nemerov (29 February 1920--5 July 1991) was an American poet, twice appointed Poet Laureate Consultant in Poetry to the Library of Congress from 1963 to 1964, and again from 1988 to 1990.
Split into simpler sentences: Howard Nemerov (29 February 1920--5 July 1991) was an American poet. He was twice appointed Poet Laureate Consultant in Poetry to the Library of Congress from 1963 to 1964, and again from 1988 to 1990.