Complex sentence: The Nashville Symphony's story began in 1920 when a group of amateur and professional musicians formed their own orchestra and organized The Symphony Society, electing Nashville Banner music critic and Vanderbilt University professor George Pullen Jackson their president and manager.
Split into simpler sentences: The Nashville Symphony was founded in 1920 when a group of amateur and professional musicians formed their own orchestra and organized The Symphony Society. They had elected "Nashville Banner" music critic and Vanderbilt University professor George Pullen Jackson their president and manager.