Complex sentence: The "C. elegans" genome is approximately 100 million base pairs long and consists of six chromosomes (named I, II, III, IV, V and X) and a mitochondrial genome.
Split into simpler sentences: The "C. elegans" genome sequence is approximately 100 million base pairs long. The genome consists of six chromosomes (named I, II, III, IV, V and X) and a mitochondrial genome.