Complex sentence: After leaving EMI, he formed his own publishing company, "Teracel" and developed, produced, managed, and published country male vocal trio Rascal Flatts who were playing in a small Nashville bar when he first heard them and realized their potential.
Split into simpler sentences: After leaving EMI, he formed his own publishing company, called "Teracel". He heard three musicians who were playing in a small Nashville bar and realized their potential.