Original sentence: The area where Northern Italian dialects are spoken roughly corresponds to Northern Italy (sometimes called Padania).Today, Northern Italian varieties are spoken by far fewer people in its area than Italian.Traditionally spoken in Northern Italy, Southern Switzerland, San Marino and Monaco, most Northern Italian varieties have given way to Standard Italian and its regional variations.Varieties of Northern Italian are also found in Sicily, corresponding with the central-eastern parts of the island that received large numbers of immigrants from Northern Italy during the decades following the Norman conquest of Sicily (around 1080 to 1120)
Edited sentence: Northern Italian and its subgroups is today spoken by far fewer people in its area than Italian.The area where Northern Italian is spoken roughly corresponds to Northern Italy (sometimes called Padania).Traditionally spoken in Northern Italy, Southern Switzerland, San Marino and Monaco, most of the language has given way to Standard Italian and its regional variations.Varieties of Northern Italian  also found in Sicily, corresponding with the central-eastern parts of the island that received large numbers of immigrants from Northern Italy during the decades following the Norman conquest of Sicily (around 1080 to 1120)