Complex sentence: In the 1910 ballet Shéhérazade (also by Ravel) she and Nijinska's brother Vaslav Nijinsky both had leading roles, dancing together in a scene Nijinska called "breathtaking".
Split into simpler sentences: In the 1910 ballet Shéhérazade (music also by Ravel) she and Vaslav Nijinsky (Nijinska's brother) both had leading roles. They danced together in a scene Nijinska called "breathtaking".