Complex sentence: The Pinakes ("tables", plural of) was the first library catalogue, was prepared by Callimachus of Cyrene during his tenure working at the Library of Alexandria in Alexandria, Egypt during the third century BCE.
Split into simpler sentences: The Pinakes ("tables", plural of) was the first library catalogue. It was prepared by Callimachus of Cyrene during his tenure working at the Library of Alexandria in Alexandria, Egypt, starting in the third century BCE.