WordNet sense 1 (get a divorce; formally terminate a marriage):

divorce

WordNet sense 2 (separate into parts or portions):

dissever, divide, separate, split, separate, carve up

WordNet sense 3 (discontinue an association or relation; go different ways):

break, part, break up

WordNet sense 4 (an increase in the number of outstanding shares of a corporation without changing the shareholders' equity):

stock split

WordNet sense 5 (become separated into pieces or fragments):

fall apart, come apart