Complex sentence: Although the Greek Constitution of 1974 vested him with considerable powers on paper, in practice the president took a largely ceremonial role; the Prime Minister of Greece is the active chief executive of the Greek government and the country's leading political figure.
Split into simpler sentences: Although the Greek Constitution of 1974 vested him with considerable powers on paper, in practice the president took a largely ceremonial role. The Prime Minister of Greece is the active chief executive of the Greek government and the country's leading political figure.