Complex sentence: His legs are remarkably short for his size, black in colour, but tremendously powerful, the feet are webbed till within five inches of the toes, which then terminate in immense claws of most destructive nature.
Split into simpler sentences: His legs are remarkably short for his size, black, and tremendously powerful. The feet are webbed till within five inches of the toes, which then terminate in immense claws of most destructive nature.