Complex sentence: In September 2001, the first Annual "Great Night In Harlem" Benefit Concert at the Apollo Theater happened-it was the first concert in 50 years to bring jazz music back to the Apollo.
Split into simpler sentences: In September 2001, the first annual "A Great Night In Harlem" Benefit Concert at the Apollo Theater happened. It was the first concert in 50 years to bring jazz music back to the Apollo.