Complex sentence: One of the most common apéritifs is sherry, but it varies from region to region: for example, in Greece, ouzo is a common apéritif, whereas in the United States, it would be rare to have ouzo as an apéritif.
Split into simpler sentences: One of the most common apéritifs is sherry, but it varies from region to region. For example, in Greece, ouzo is a common apéritif, whereas in the United States, it would be rare to have ouzo as an apéritif.