Complex sentence: Saint-Omer ("Sint-Omaars" in Dutch) is a commune and sub-prefecture of the Pas-de-Calais department west-northwest of Lille on the railway to Calais.
Split into simpler sentences: Saint-Omer ("Sint-Omaars" in Dutch) is a commune in France. It is a commune and sub-prefecture of the Pas-de-Calais department west-northwest of Lille on the railway to Calais.