Complex sentence: Carlson started his career as a psychotherapist and ran a stress management centre, and published his first book in 1985, but became famous when his 10th book, "Don't Sweat the Small Stuff... and it's all Small Stuff".
Split into simpler sentences: Carlson started his career as a psychotherapist and ran a stress management centre. He published his first book in 1985, but became famous with his 10th book, "Don't Sweat the Small Stuff... and it's all Small Stuff".