Complex sentence: Realising she still has feelings for Phil, Sharon tries to seduce him; he kisses her in a moment of passion that he immediately regrets, so Sharon convinces herself she is happy with Grant and considers having children with him.
Split into simpler sentences: Realising she still has feelings for Phil, Sharon tries to seduce him. Phil kisses her in a moment of passion that he immediately regrets, so Sharon convinces herself she is happy with Grant and considers having children with him.