Complex sentence: It is a word which appears to be in common use within towns that have historic Irish communities, for example Salford, Manchester, Warrington, Knowsley, St. Helens and Liverpool, where it is sometimes abbreviated to "scall".
Split into simpler sentences: It is a word which appears to be in common use within towns that have historic Irish communities, for example Knowsley, Liverpool, Manchester, Salford, St. Helens and Warrington. In Liverpool it is sometimes abbreviated to "scall".