Complex sentence: The feud between the Roach Guards and the Dead Rabbits were especially violent as they fought over the Bowery area and, despite constant infighting, managed to hold their own in the "slugger battles" against the more organized and disciplined Dead Rabbits.
Split into simpler sentences: The feud between the Roach Guards and the Dead Rabbits was especially violent as they fought over the Bowery area. Despite constant infighting, they managed to hold their own in the "slugger battles" against the more organized and disciplined Dead Rabbits.