Complex sentence: Spanish is one of the six official languages of the United Nations, and it is used as an official language by the European Union, the Organization of American States, and the Union of South American Nations, among many other international organizations.
Split into simpler sentences: Spanish is one of the six official languages of the United Nations. It is also used as an official language by the European Union, the Organization of American States, and the Union of South American Nations, and by many other international organizations.