Complex sentence: She also gave recitals in Hamburg, Vienna, Paris, and became a favorite at the Salzburg Festival, where she sang in recital in 1975,1977,1978,1980,1981, and 1984.
Split into simpler sentences: She also gave recitals in Hamburg, Vienna, Paris, and the Salzburg Festival. At the latter she became a favorite, appearing in 1975,1977,1978,1980,1981, and 1984.