Complex sentence: Kahn's ambition was to be a musician, and he learned to play several instruments before he graduated from the gymnasium, but he was one of eight children, and his father had set plans for the career of each one.
Split into simpler sentences: Kahn's ambition was to be a musician, and he learned to play several instruments before he graduated from the gymnasium. But he was one of eight children, and his father had set plans for the career of each one.