Complex sentence: The film suggests Nijinsky was driven into madness by both his consuming ambition and self-enforced heterosexuality, the latter prompted by his romantic involvement with Romola de Pulszky, a society girl who joins impresario Sergei Diaghilev's Ballets Russes specifically to seduce Nijinsky.
Split into simpler sentences: The film suggests Nijinsky was driven into madness by both his consuming ambition and self-enforced heterosexuality. He became involved with Romola de Pulszky, a society girl who joined impresario Sergei Diaghilev's Ballets Russes specifically to seduce Nijinsky.