Complex sentence: In contrast, scientific or biological nomenclature is a global system that uniquely denotes particular organisms; biological nomenclature has formal rules and periodic international meetings, of the ICBN and the ICZN.
Split into simpler sentences: In contrast, scientific or biological nomenclature is a global system that uniquely denotes particular organisms. Biological nomenclature involves formal rules and periodic international meetings, of the ICBN and the ICZN.