Complex sentence: As Prime Minister, Balfour was unable to give a coherent direction to his party over tariff reform and Irish home rule, though he oversaw the Entente Cordiale, an alliance with France that led to Britain's involvement in WW1.
Split into simpler sentences: As Prime Minister, Balfour was unable to give a coherent direction to his party over tariff reform and Irish home rule. He oversaw the Entente Cordiale, an alliance with France that led to Britain's involvement in WW1.