Complex sentence: Kelly was drafted into the army in September 1952, and stayed for two years, ending that period with a music performance for an audience of 10,000 in the Chastain Memorial Park Amphitheater in Atlanta, Georgia.
Split into simpler sentences: Kelly was drafted into the army in September 1952, and stayed for two years. He ended his military service with a music performance for an audience of 10,000 in the Chastain Memorial Park Amphitheater in Atlanta, Georgia.