Complex sentence: C melody saxophones were and are as good as the reputation of whichever company manufactured them e.g. C.G. Conn. The problem was that the Great Depression which followed immediately after the stock market crash of 1929 caused harsh economic conditions throughout the world.
Split into simpler sentences: C melody saxophones were as good as the reputation of whichever company manufactured them. The basic problem was that the Great Depression which followed immediately after the stock market crash of 1929 caused harsh economic conditions throughout the world.