Complex sentence: Most of the Cowboys, including the Clantons and McLaurys, were Democrats and Confederate sympathizers from Southern states, especially Texas, who saw the business owners and the lawmen, especially the Earps, as Northern Republican carpetbaggers.
Split into simpler sentences: Most of the Cowboys, including the Clantons and McLaurys, were Democrats and Confederate sympathizers from Southern states, especially Texas. They considered the business owners and the lawmen, especially the Earps, to be Northern Republican carpetbaggers.