Karyokinesis
Noun
かくぶんれつ
核分裂の過程について、分かりやすいスライドショーを作ってもらえますか。
Can you make an easy-to-understand slide show on the process of nuclear fission?
分裂 means "split" or "division." The nucleus version of this split is nuclear fission.
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.