Complex sentence: Both live together but most of the time are annoyed by each other presence, at one point the tension rises to unbearable levels for both and she forces him to leave, only to later realize that she needs him.
Split into simpler sentences: Both live together but most of the time are annoyed by each other's presence. At one point the tension rises to unbearable levels for both and she forces him to leave, only to later realize that she needs him.