Complex sentence: Dinklage has described his brother, who is a violinist, as being the "real performer of the family", saying that his brother's passion for the violin was the only thing that kept him from pursuing acting.
Split into simpler sentences: Dinklage has described his brother, who's a violinist, as being the "real performer of the family". Saying that his brothers passion for the violin was the only thing that kept him from pursuing acting.