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.

Calvin Mooers in his TRAC language is generally credited with inventing " command substitution " , the ability to embed commands in scripts that when interpreted insert a character string into the script .
Calvin Mooers in his TRAC language is generally given credit with inventing " command substitution " .

Unfortunately , the coaster gained a reputation as a rough and uncomfortable ride experience , which earned the coaster the nickname , " Hurt-Your-Knees " by roller coaster enthusiasts .
It was so rough , it was given the nickname , " Hurt 's your knees . "

The Zulu ( ; ) are a Bantu ethnic group of Southern Africa and the largest ethnic group in South Africa , with an estimated 10 – 12 million people living mainly in the province of KwaZulu-Natal .

There are 10-11 million Zulu living in South Africa , mostly in KwaZulu-Natal province .

