Complex sentence: In autumn of 1987, Sergey Ignatyev participated in the National exhibition of young artists in Tashkent in the Central Exhibition Hall where his triptych "Prisoner", "Pomegranate", "Iron and Milk" paintings were exhibited.
Split into simpler sentences: In autumn of 1987, Sergey Ignatyev participated in the National exhibition of young artists in Tashkent. It took place in the Central Exhibition Hall, where his triptych "Prisoner", "Pomegranate", and "Iron and Milk" paintings were exhibited.