Complex sentence: The massive Neutron output of the lower explosive yielding little Boy bomb at Hiroshima was much higher than the, more destructive, higher explosive yielding Fat Man bomb at Nagasaki, this discrepancy is due to vast differences in their respective designs.
Split into simpler sentences: The massive neutron output of the lower explosive-yielding Little Boy bomb at Hiroshima was much higher than that of the more destructive, higher explosive yielding Fat Man bomb at Nagasaki. This discrepancy is due to vast differences in their respective designs.