Simplify the following text for a Grade 13 native English-speaking person.
Original: Offenbach 's numerous operettas , such as Orpheus in the Underworld , and La belle HÃ lÃ ne , were extremely popular in both France and the English-speaking world during the 1850s and 1860s .
Simplified: Offenbach 's many operettas , such as Orpheus in the Underworld , and La belle HÃ lÃ ne , were extremely popular both in France and elsewhere in the 1850s and 1860s .