Complex sentence: Because of her debut album's poor performance, Dawn had decided to leave the country music scene; however, she later received a call from Vince Gill, who had asked her to join his road band as a harmony vocalist.
Split into simpler sentences: Because of her debut album's poor performance, Sears had decided to leave the country music scene. However, she later received a call from Vince Gill, who had asked her to join his road band as a harmony vocalist.