You will be given a definition of a task first, then some input of the task.
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.

Freyberg thought there was only a 50 % chance of success for the attack .
Output:
Freyberg had informed his superiors that he believed , given the circumstances , there was no better than a 50 per cent chance of success for the offensive .