Complex sentence: However, Europe contains several large peninsulas, including the Balkan Peninsula, Greece, Italy and the Iberian Peninsula; during the Ice Ages, Great Britain and Ireland were another single peninsula extending from the body of the continent.
Split into simpler sentences: However, Europe contains several large peninsulas, including the Balkan, the Iberian and the Italian peninsulas. During the Ice Ages, the British Isles were another single peninsula extending from the body of the continent.