Complex sentence: He is the son of Italian footballer Valentino Mazzola, player of the Grande Torino who died in the Superga air disaster; his younger brother, Ferruccio Mazzola, was also a footballer, who died in 2013.
Split into simpler sentences: He is the son of Italian footballer Valentino Mazzola, player of the "Grande Torino" who died in the Superga air disaster. Sandro Mazzola's younger brother, Ferruccio Mazzola, was also a footballer, who died in 2013.