Complex sentence: The mountain consists almost entirely of Granite and diorite, weathered over centuries into a wide variety of shapes, including over 12,000 picturesque stone formations, ravines, cliffs, stone pillars and peaks.
Split into simpler sentences: The mountain consists almost entirely of Granite and diorite, which have been weathered over centuries to create a wide variety of shapes. There are a great number of picturesque stone formations, ravines, cliffs, stone pillars and peaks.