Complex sentence: In the US, just in the depleted uranium (DU) waste alone, there is more than 10 times the extractable energy than from coal in the ground which is enough energy to power the entire planet for about 700 years at current usage rates.
Split into simpler sentences: In the US, there is more than 10 times the extractable energy from DU waste alone than from coal still in the ground. This is enough energy to power the entire planet for about 700 years at current usage rates.