Complex sentence: Although it is now called the Balanced Rock, it is in fact a pedestal rock-a single piece of stone that has weathered in such a fashion that its mid-section is narrower than its cap or its base.
Split into simpler sentences: Although it is now called the Balanced Rock, it is not a balanced rock at all, but a pedestal rock. A pedestal rock is a single piece of stone that has weathered in such a fashion that its mid-section is narrower than its cap or its base.