Complex sentence: The Radical Party (PR) was a political party in Italy which for decadeswas a bastion of liberalism and radicalism in Italy and proposed itself as the strongest opposition to the Italian political establishment, seen as corrupt and conservative.
Split into simpler sentences: The Radical Party (PR) was a political party in Italy. For decades it was a bastion of liberalism and radicalism in Italy and proposed itself as the strongest opposition to the Italian political establishment, seen as corrupt and conservative.