Complex sentence: The human genome is the complete set of nucleic acid sequenc for humans ("Homo sapiens"), encoded as DNA within the 23 chromosome pairs in cell nuclei and in a small DNA molecule found within individual mitochondria.
Split into simpler sentences: The human genome is the complete set of genetic information for humans ("Homo sapiens"). This information is encoded as the nucleic acid sequenc of DNA within the 23 chromosome pairs in cell nuclei and in a small DNA molecule found within individual mitochondria.