Complex sentence: To the alcohol is added anise, and sometimes other flavorings such as star anise, coriander, cloves, and cinnamon; the flavoring ingredients are often closely guarded company secrets, and distinguish one ouzo from another.
Split into simpler sentences: To the alcohol is added anise and optionally other flavorings, such as star anise, coriander, cloves, and cinnamon. The exact flavoring ingredients are often closely guarded company secrets, and serve to distinguish one Ouzo from another.