Complex sentence: The music school's most famous alumni were women who were influential pioneers in music performance, including choral conducting, and composition in the 20th century, such as Nora Douglas Holt, Eva Jessye, and Etta Moten Barnett.
Split into simpler sentences: The music school's most famous alumni were women who became influential pioneers of the 20th century in composition and music performance, including choral conducting. They included Nora Douglas Holt, Eva Jessye, and Etta Moten Barnett.