The subject of this sentence is

variation, a stuttering, a trial of errors, rudely spit exuberance, a feast, where qualified, of scattergun subordination ripe with change, a tense refusal to accept polite allusion, certain imprecision, disambiguation come unhinged and, homeless, spatterstrewn with a poet’s force at stubborn, dumb, recalcitrant realities, complexly inarticulate, a verbless gesture of unholy insignificance, performer’s art.