Complex sentence: He has written one book'The Boy Files' for Wayland Books and was the agony uncle of "Sugar" magazine for six years starting in September 2004 and ending in February 2010.
Split into simpler sentences: He has written one book'The Boy Files' for Wayland Books. He was the agony uncle of "Sugar" magazine for six years starting in September 2004 and ending in February 2010.