Complex sentence: Helen sang in concert halls and theatres in Edinburgh and across Scotland, being particularly involved in the Temperance Movement, when she adopted the name of Sister Cathedral (sometimes known as Sister Helen Acquroff), as well as a humorous irreverant style.
Split into simpler sentences: Helen sang in concert halls and theatres in Edinburgh and across Scotland, being particularly involved in the Temperance Movement. She adopted the name "Sister Cathedral" (sometimes "Sister Helen Acquroff"), as well as a humorous irreverant style.