Simplify the following text for a Grade 13 native English-speaking person.
Original: Indeed , together with Trento , Trieste was the main focus of the Italian irredentist movement , which aimed for the annexation to Italy of all the lands they claimed were inhabited by an Italian speaking population .
Simplified: Together with Trento , Trieste was a main focus of the irredentist movement , which aimed for the annexation to Italy of all the lands they claimed were inhabited by an Italian speaking population .