Complex sentence: Unfortunately, the original source is not currently available on the internet and can only be found in a few libraries around the world, however Korthals' classification was reviewed and confirmed and his original latin description was included in a 1897 publication by George Haviland.
Split into simpler sentences: Unfortunately, the original source is not currently available on the internet, and can only be found in a few libraries around the world. However, Korthals' classification was reviewed and confirmed and his original latin description was included in a 1897 publication by George Haviland.