Complex sentence: In Dublin he formed part of the Envoy arts review/McDaid's pub circle of artistic and literary figures that included Patrick Kavanagh, Anthony Cronin and Brendan Behan.
Split into simpler sentences: In Dublin he formed part of the Envoy arts review/McDaid's pub circle of artistic and literary figures. A circle that included Patrick Kavanagh, Anthony Cronin and Brendan Behan.