instruction:
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.
question:
A pipe bomb is an improvised explosive device , which uses a tightly sealed section of pipe filled with an explosive material .
answer:
A Pipe bomb is a kind of explosive bomb .

question:
A critically endangered ( CR ) species is one that has been categorized by the International Union for Conservation of Nature ( IUCN ) as facing an extremely high risk of extinction in the wild .
answer:
A critically endangered species is a species of plant or animal , that has an extremely high chance of dying out in the future .

question:
Semmelweis 's practice earned widespread acceptance only years after his death , when Louis Pasteur developed the germ theory of disease , offering a theoretical explanation for Semmelweis 's findings .
answer:
People such as Louis Pasteur proved what is known as the germ theory of disease only after Semmelweis ' death .