Complex sentence: A month later, he made his last TV appearance on "Strictly Children in Need Special", with filming for this taking place prior to him undergoing surgery for an abdominal aortic aneurysm on 12 November.
Split into simpler sentences: A month later, he made his last TV appearance, on "Strictly Children in Need Special". Filming took place prior to Forsyth undergoing surgery for an abdominal aortic aneurysm on 12 November.