Complex sentence: The Italian Unification happened relatively late compared to other large western European nations.Ater having been the Kingdom of Italy for nearly one century (1860--1946), it became the Italian Republic in 1946.
Split into simpler sentences: The Italian Unification happened relatively late compared to other large western European nations. After having been the Kingdom of Italy for nearly one century (1860--1946), it became the Italian Republic in 1946.