Complex sentence: She danced during the Soviet era at the same time as another famed Russian ballerina Galina Ulanova, and in 1960 took over Ulanova's title as prima ballerina assoluta of the Bolshoi.
Split into simpler sentences: She danced during the Soviet era at the same time as Galina Ulanova, another famed Russian ballerina. In 1960 she ascended to Ulanova's former title as prima ballerina assoluta of the Bolshoi.