Complex sentence: In 1921, the impresario Lusardi introduced Granforte to La Scala in Milan; conductor Arturo Toscanini entrusted the role of Amfortas to him, and in 1921 he made his debut there.
Split into simpler sentences: In 1921, the impresario Lusardi introduced Granforte to La Scala in Milan. Conductor Arturo Toscanini entrusted the role of Amfortas to him, and in 1921 he made his debut there.