Complex sentence: Maciunas set up the AG Gallery in New York, 1961, with the intention of putting on events and selling books and multiples by artists he liked; the gallery closed within a year, apparently having failed to sell a single item.
Split into simpler sentences: Maciunas set up the AG Gallery in New York, 1961, with the intention of putting on events and selling books and multiples by artists he liked. The gallery closed within a year, apparently having failed to sell a single item.