What's the difference between Sicilian and Italian?
Unlike Italian, which is almost entirely Latin based, Sicilian has elements of Greek, Arabic, French, Catalan, and Spanish. ... A great deal of the actual Italian influence on Sicilian has been since 1860, when, during the Italian Unification, Sicily became a part of Italy.

Reference:
Sicilian and Italian: What's the difference? - Mango Languages Blog
Jun 2, 2010