Complex sentence: In the summer of 2003, he gave highly-acclaimed performances of all five Beethoven piano concertos with the Los Angeles Chamber Orchestra over two consecutive nights at the Hollywood Bowl; he repeated the feat at Ravinia with the Chicago Symphony in the summer of 2004.
Split into simpler sentences: In the summer of 2003, Kahane performanced of all five Beethoven piano concertos with the Los Angeles Chamber Orchestra over two consecutive nights at the Hollywood Bowl. He repeated the cycle at Ravinia with the Chicago Symphony in the summer of 2004.