Complex sentence: Gluzman plays the 1690 Stradivarius violin known as the "ex-Leopold Auer" (after its previous owner, the Hungarian violinist Leopold Auer); it is on extended loan from the Stradivari Society of Chicago.
Split into simpler sentences: Gluzman plays the 1690 Stradivarius violin, known as the "Ex-Leopold Auer" (after its previous owner, Hungarian violinist Leopold Auer). It is on extended loan from the Stradivari Society of Chicago.