Complex sentence: 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.
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.