Simplify the following text for a Grade 11 native English-speaking person.
Original: The Italian irredentism was actively followed by many Italians in Istria ( called Istrian Italians ) , like the Italian hero Nazario Sauro of Capodistria ( actual Koper ) .
Simplified: The Italian irredentism was actively followed by many Italians in Istria , like the Italian hero Nazario Sauro of Capodistria .