Complex sentence: Art moved with his mother, brother and sister to Phoenix, Arizona when he was still four, and he started playing the piano from elementary school, before moving on to bass tuba and violin, settling on cornet and then trumpet from the age of thirteen.
Split into simpler sentences: Art moved with his mother, brother and sister to Phoenix, Arizona when he was still four. He started to play the piano while in elementary school, then moved on to bass tuba and violin before settling on cornet and then trumpet at the age of thirteen.