In this task, we ask you to rewrite a sentence in simple English without changing its general meaning. Essentially, you want to make the sentence easier to read by using simpler words, utilizing more straightforward sentence structures, and omitting non-essential information etc.

Japan 's cadre of highly skilled carrier aircrews with which it began the war were , in effect , irreplaceable because of an institutionalised limitation in its training programs and the absence of a pool of experienced reserves or advanced training programs for new airmen .
Japan 's highly skilled carrier aircrews could not be replaced because the training programs could not produce enough new aircrew .

To the south in the Saar-Palatinate region , Lieutenant General George S. Patton 's U.S. 3rd Army had dealt a devastating blow to the German 7th Army and , in conjunction with the U.S. 7th Army , had nearly destroyed the German 1st Army .
To the south in the Saar-Palatinate region , Lt. Gen. George S. Patton 's 3rd Army had beaten the German 7th Army and the German 1st Army .

A fad , trend , or craze is any form of collective behavior that develops within a culture , a generation or social group in which a group of people enthusiastically follow an impulse for a finite period .
A trend or a fad is a type of behavior that develops in a large population .