Complex sentence: It will become an annual tradition there, and for the next ten years, the San Francisco Ballet will be the only ballet company in the United States performing the complete work, until George Balanchine premieres his version in New York in 1954.
Split into simpler sentences: It will become an annual tradition there, and for the next ten years, the San Francisco Ballet will be the only company in the United States performing the complete work. Until George Balanchine premieres his version in New York in 1954.