Simplify the following text for a Grade 8 native English-speaking person.
Original: This enables the compaction necessary to fit the large genomes of eukaryotes inside cell nuclei : the compacted molecule is 40,000 times shorter than an unpacked molecule .
Simplified: This packs in the large genomes of eukaryotes to fit inside cell nuclei . The compacted molecule is 40,000 times shorter than an unpacked molecule .