Complex sentence: The Master Singers were a British vocal group of schoolmasters in the 1960s, who specialised in comedic recordings of mundane documents and announcements such as the weather forecast and "Highway Code", performed "a cappella" as Anglican chant.
Split into simpler sentences: The Master Singers were a British vocal group of schoolmasters in the 1960s. They specialised in comedic recordings of mundane documents and announcements such as the weather forecast and "Highway Code", performed "a cappella" as Anglican chant.