Complex sentence: The usage of anthems increased among European countries during the 18th and 19th centuries; the oldest national anthem is "Het Wilhelmus", the Dutch national anthem, written between 1568 and 1572.
Split into simpler sentences: The usage of anthems increased among European countries during the 18th and 19th centuries. The oldest national anthem is "Het Wilhelmus", the Dutch national anthem, written between 1568 and 1572.