Task: Text Simplification
Input (English): offenbach 's numerous operettas , such as orpheus in the underworld , and la belle hélène , were extremely popular in both france and the english-speaking world during the 1850s and 1860s.
Output (English): offenbach 's operettas , such as orpheus in the underworld and la belle hélène , were very popular in france and the english-speaking world during the 1850 's and 1860 's.