Complex sentence: Duchamp sanctioned replicas of "The Large Glass", the first in 1961 for an exhibition at Moderna Museet in Stockholm and another in 1966 for the Tate Gallery in London.
Split into simpler sentences: Duchamp sanctioned replicas of "The Large Glass". The first in 1961 for an exhibition at Moderna Museet in Stockholm, and another in 1966 for the Tate Gallery in London.