Complex sentence: The Professor, who decided to adopt Alraune as his daughter, sends her to a convent to study; and although sheltered from the influences of the outside world, Alraune grows up quite promiscuous and troublesome.
Split into simpler sentences: The Professor, who decided to adopt Alraune as his daughter, sends her to a convent to study. Although she is sheltered from the influences of the outside world, Alraune grows up quite promiscuous and troublesome.