Complex sentence: It is dangerous to try to read the carved letters which are less than an inch from the drop off point of the bottom letters and in the 1950s only a small child can even get close to the letters without falling off.
Split into simpler sentences: It is dangerous to try to read the carved letters which are less than an inch from the drop-off point of the bottom letters. Only a small child can even get close to the letters without falling off.