Complex sentence: It belongs to the phylum Gammaproteobacteria and had its own phyletic line within the phylum because its 16S gene sequences were no more than 90% similar to any other Gammaproteobacteria gene sequences, and thus represented a novel species within a new genus.
Split into simpler sentences: It belongs to the phylum Gammaproteobacteria and had its own phyletic line within the phylum. Its 16S rRNA gene sequences were no more than 90% similar to any other Gammaproteobacteria gene sequences, and thus represented a novel species within a new genus.