Complex sentence: Running from the Adda river, in the vicinity of Trezzo sull'Adda, to Milan, it was also known as Naviglio Piccolo and it is part of the system of navigli of the Milan area.
Split into simpler sentences: Running from the Adda river, in the vicinity of Trezzo sull'Adda, to Milan, it was also known as Naviglio Piccolo. It is part of the system of navigli of the Milan area.