Complex sentence: He also contributed to the draft of a book on the birds of Arabia by George Latimer Bates, however it was never published, but made use of in a work on the same subject by Richard Meinertzhagen.
Split into simpler sentences: He also contributed to the draft of a book on the birds of Arabia by George Latimer Bates. However, it was never published, but was made use of in a work on the same subject by Richard Meinertzhagen.