Complex sentence: 'The Night Before Larry was Stretched' is an execution ballad written in the Newgate cant, a short-lived colloquial slang of 19th century Dublin.
Split into simpler sentences: 'The Night Before Larry was Stretched' is an execution ballad written in the Newgate cant. The Newgate cant in which the song was penned was a short-lived colloquial slang of 19th century Dublin.