Complex sentence: Eventually, he and is family moved to Franklin, Tennessee, where Zac started playing the drums at the age of 9, when he was the only one who volunteered to play them in a program at school.
Split into simpler sentences: Eventually, he and his family moved to Franklin, Tennessee, where Zac started playing the drums at the age of 9. He was the only one who volunteered to play them in a program at school.