Sentence:  Following two earlier major Sigmar Polke shows, at Tate Liverpool in 1996 and Tate Modern in 2005, this extensive retrospective aims to show the German painter, film-maker and sculptor in full. A founder, with Gerhard Richter, of <WSD>capitalist realism</WSD> (a rejoinder to British and American pop art) in the 1960s), Polke went on to make an enormous variety of hallucinatory, poisonous, gorgeous and unsettling works that still reverberate with a strange, dark humour. 
Meaning of the word marked with <WSD> tags:  A German pop art movement (1963-1966).