Complex sentence: Published 1855 and in a revised edition (with many more languages added) in 1863, it was comprehensive but it was not used much as it contains a lot of diacritic marks and therefore was difficult to read, write and typeset at that time.
Split into simpler sentences: Published 1855 and in a revised edition (with many more languages added) in 1863. It was comprehensive but it was not used much as it contains a lot of diacritic marks and therefore was difficult to read, write and typeset at that time.