Complex sentence: Following the Hundred Years' Wars, England became embroiled in its own succession wars; the Wars of the Roses pitted two branches of the House of Plantagenet against one another, the House of York and the House of Lancaster.
Split into simpler sentences: Following the Hundred Years' Wars, England became embroiled in its own succession wars. The Wars of the Roses pitted two branches of the House of Plantagenet against one another, the House of York and the House of Lancaster.