Complex sentence: For the first time, severely virilized infants with this disorder were surviving and could be operated upon.Hormone assays and karyotyping to ascertain sex chromosomes, and the availability of testosterone for treatment led to partial understanding of androgen insensitivity syndrome.
Split into simpler sentences: For the first time, severely virilized infants with this disorder were surviving and could be operated upon. Development of hormone assays and karyotyping to ascertain sex chromosomes, and the availability of testosterone for treatment led to partial understanding of androgen insensitivity syndrome.