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.

The retina has no sensitivity to pain , and the effects of retinal damage may not appear for hours , so there is no warning that injury is occurring .
The retina does not feel pain , so damage may not be felt for hours .

Dauphin of France ( , ; -RSB- ) , originally Dauphin of Viennois ( " Dauphin de Viennois " ) , was the title given to the heir apparent to the throne of France from 1350 to 1791 and 1824 to 1830 .
The Dauphin was the heir apparent to the throne of France from 1350 – 1791 , and from 1824 – 1830 .

The Aosta Valley ( -RSB- ( official ) or ( usual ) ; -RSB- ( official ) or ( usual ) ; ( usual ) ; or ; ) is a mountainous autonomous region in northwestern Italy .

Valle d 'Aosta is a mountainous region in northwestern Italy .