Original sentence: It contained 64 kg of uranium, of which 0.7 kg underwent nuclear fission, and of this mass only 0.6 g was transformed into energy.The Mk I "Little Boy" was 10 feet (3.0 m) in length, 28 inches (71 cm) in diameter and weighed 8,900 lb (4 000 kg)
Edited sentence: It contained 64 kg of uranium, of which 0.7 kg underwent nuclear fission, and of this mass only 0.6 g was transformed into energy.The Mk I "Little Boy" was 10 feet (3.0 m) in length, 28 inches (71 cm) in diameter and weighed 8,900 lb (4 000 kg)