Complex sentence: Galeria Akumulatory 2 in Poznań was one of the key Polish locations exhibiting international art trends such as conceptual art or Fluxus from 1972 to 1989--and so it hosted numerous solo exhibitions by international conceptual artists and the Fluxus Festival in 1977.
Split into simpler sentences: Galeria Akumulatory 2 in Poznań was a Polish gallery exhibiting international art trends such as conceptual art or Fluxus from 1972 to 1989. It hosted numerous solo exhibitions by international conceptual artists and the Fluxus Festival in 1977.