Complex sentence: Since at least the early 1900s zoologists commonly recognized this as the last edition belonging to this series, it was also officially regarded by the International Commission on Zoological Nomenclature in Opinion 296 (26 Oct 1954) as the 13th edition of "Systema Naturae".
Split into simpler sentences: Since at least the early 1900s zoologists commonly recognized this as the last edition belonging to this series. It was also officially regarded by the International Commission on Zoological Nomenclature in Opinion 296 (26 Oct 1954) as the 13th edition of "Systema Naturae".