Complex sentence: He was the son of Herbert Henry Asquith, the Prime Minister of the United Kingdom during World War I, and Margot Asquith and he was known as'Puffin'.
Split into simpler sentences: He was the son of Herbert Henry Asquith, the Prime Minister of the United Kingdom during World War I, and Margot Asquith. Within his family he was known as'Puffin'.