Complex sentence: Documentation of the work of these four artists suggests that there was no consciously identified group or status of membership in a "actionist" group, rather, this name was one applied to various collaborative configurations among these four artists.
Split into simpler sentences: Documentation of the work of these four artists suggests that there was no consciously developed sense of a movement or any cultivation of membership status in a "actionist" group. Rather, this name was one applied to various collaborative configurations among these four artists.