Task: Text Simplification
Input (English): The loss of four large fleet carriers and over 40 % of the carriers ' highly trained aircraft mechanics and technicians , plus the essential flight-deck crews and armorers , and the loss of organizational knowledge embodied in such highly trained crews , were still heavy blows to the Japanese carrier fleet .
Output (English): However , the loss of four large fleet carriers , and over 40 % of the carriers ' aircraft mechanics and technicians , plus the flight-deck crews were very damaging to the Japanese carrier fleet .