Complex sentence: This theory is supported by research which found that women respond less negatively to sexual adverts when it is in the context of gift giving from a man to a women, therefore when the sexuality of the advert is the context of commitment.
Split into simpler sentences: This theory is supported by research which found that women respond less negatively to sexual adverts when it is in the context of gift giving from a man to a women. Therefore react less negatively when the sexuality of the advert is the context of commitment.