Complex sentence: Arthur Curley (January 22,1938--March 31,1998) was an American librarian who was listed as one of the 100 most important library leaders of the 20th century by journal "American Libraries".
Split into simpler sentences: Arthur Curley (January 22,1938--March 31,1998) was an American librarian. He was listed as one of the 100 most important library leaders of the 20th century by the journal "American Libraries".