Complex sentence: He was especially noted in the field of obstetrics and gynaecology, handling approximately 5,500 charity obstetrical cases without the loss of child or mother during his 20 years of service to humanity.
Split into simpler sentences: He was especially noted in the field of obstetrics and gynaecology. He handled approximately 5,500 charity obstetrical cases without the loss of child or mother during his 20 years of service to humanity.