Original: 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.
Simplified: Offenbach's many operettas, such as Orpheus in the Underworld, and La belle Hélène, were extremely popular both in France and elsewhere in the 1850s and 1860s.