Complex sentence: Some women who engage in adult breast feeding report that it leads to a very close and mutually dependent relationship because a frequent schedule of breast feeding is needed to keep milk flowing and to prevent too much milk in her breasts.
Split into simpler sentences: Some women who engage in adult breast feeding report that it leads to a very close and mutually dependent relationship. This relationship may also occur because a frequent schedule of breast feeding is needed to keep milk flowing and to prevent too much milk in her breasts.