Complex sentence: The Diplomatic Revolution of 1756 was the reversal of longstanding alliances in Europe between the War of the Austrian Succession and the Seven Years' War; the shift has also been known as "the great change of partners".
Split into simpler sentences: The Diplomatic Revolution of 1756 was the reversal of longstanding alliances in Europe between the War of the Austrian Succession and the Seven Years' War. The shift has also been known as "the great change of partners".