In this task, you're given a sentence and your task is to generate a simplified sentence that focuses on lexical paraphrasing from the original sentence given in the input.

Q: together they had 18 children , of whom 11 survived to adulthood.

A: together , they had eighteen children , although only eleven lived to become adults.
****
Q: captive longevity is 20 to 30 years , with rare accounts of over 40 years , reports of a individual living to 40 years in philadelphia zoo.

A: captive life expectancy is usually 20 to 30 years . however an individual lived to 40 in the philadelphia z.
****
Q: diatomic molecules are molecules composed only of two atoms , of either the same or different chemical elements.

A:
diatomic molecules are molecules that are made up of only two atoms , which are themselves made up of either the same or differing chemical elements.
****