Complex sentence: A talented singer, violinist and cellist, the 7th Prince was the major patron of Beethoven, who dedicated his Third (Eroica), Fifth, and Sixth (Pastoral) symphonies to the Prince, as well as other works.
Split into simpler sentences: A talented singer, violinist and cellist, the 7th Prince was the great patron of Beethoven. Beethoven dedicated the 3rd (Eroica), the 5th, and the 6th (Pastoral) symphonies to the Prince, as well as other works.