Complex sentence: In 1848, Charles Albert conceded a constitution known as the "Statuto Albertino" to Piedmont-Sardinia, which remained the basis of the Kingdom's legal system even after Italian unification was achieved and the Kingdom of Sardinia became the Kingdom of Italy in 1861.
Split into simpler sentences: In 1848, Charles Albert conceded a constitution known as the "Statuto Albertino" to Piedmont-Sardinia. The "Statuto Albertino" remained at the basis of the Kingdom's legal system even after Italian unification was achieved and the Kingdom of Sardinia became the Kingdom of Italy in 1861.