Complex sentence: Often senescent toxins disrupt mitotic function and lead to incorrectly formed nuclei, being damaging to the cell, this causes apoptosis to alleviate any harm a damaged cell may cause to itself and other neighboring cells.
Split into simpler sentences: Often senescent toxins disrupt mitotic function and lead to incorrectly formed nuclei. These damaged nuclei trigger apoptosis to alleviate any harm a damaged cell may cause to other neighboring cells.