Teacher: In this task, we ask you to elaborate the sentence without changing its general meaning. You can do so by explaining further the input sentence, using more precise wording, adding qualifiers and auxiliary information etc.
Teacher: Now, understand the problem? If you are still confused, see the following example:
The Inheritance Cycle is a series of fantasy books written by Christopher Paolini.
Solution: The Inheritance Cycle is a tetralogy of young adult high fantasy novels written by American author Christopher Paolini.
Reason: The output sentence elaborates on the input sentence without changing its general meaning e.g. "tetralogy of young adult high fantasy novels".

Now, solve this instance: 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 .
Student:
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 .