Sentence:  How my uncle "Toby" and Corporal "Trim" managed this matter,—with the history of their campaigns, which were no way barren of events,—may make no uninteresting under-plot in the <WSD>epitasis</WSD> and working up of this drama. 
Meaning of the word marked with <WSD> tags:  The second part of a play, in which the action begins.