Simplify the following text for a Grade 9 native English-speaking person.
Original: Mitosis and cytokinesis together define the mitotic ( M ) phase of the cell cycleâ '' the division of the mother cell into two daughter cells , genetically identical to each other and to their parent cell .
Simplified: Cytokinesis , even though it is a very important to cell division , is not considered a stage of mitosis . During cytokinesis , the cell physically splits .