original: Gramophone Archive By age 15, he had already given concerts worldwide.
simplifications: He had concerts worldwide by age 15. By age 15, he had concerts worldwide. Reported by Gramophone Archive. He performed internationally by age 15. By age 15, he had already given concerts worldwide. Gramophone Archive: By age 15, he had given concerts around the world. Gramophone Archive By 15, he had given concerts worldwide. By age 15, he had given concerts around the world. Gramophone Archive: By age 15, he had already given concerts all over the world. He had already given worldwide concerts by age 15. Gramophone Archive By the age of 15, he had performed concerts all over the world.