Complex sentence: Mia Slavenska took a shine to Tall Chief and arranged for her to audition for Serge Denham, director of the Ballet Russe de Monte Carlo, who was impressed, but nothing came of it.
Split into simpler sentences: Mia Slavenska took a shine to Tall Chief and arranged for her to audition for Serge Denham, director of the Ballet Russe de Monte Carlo. He was impressed, but nothing came of it.