Complex sentence: Barton understood that both men and women could be infertile and returned to London and established a fertility practice, pioneering AID for women who were unable to conceive a child with their husband/partner.
Split into simpler sentences: Barton understood that both men and women could be infertile. She returned to London and established a fertility practice, pioneering AID for women who were unable to conceive a child with their husband/partner.