What gives the nucleus its shape is a mesh of intermediate filaments called the nuclear lamina. It forms an interface between the chromosomes and the inside of the nuclear envelope. If these large protein fibres were to be temporarily separated into their component nuclear lamina, the nuclear envelope would pull away from the chromosomes and withdraw into the endoplasmic reticulum. Problem solved.
I am confused by the last sentence starting with "If these large proteins..." Could someone explain this in another way? I would appreciate any response. Thanks!