Complex sentence: While he had become a social radical remained a "Constitutional conservative" however and wrote his PhD thesis on the King-Byng Affair defending the positions of Arthur Meighen and Baron Byng which was published in 1943 as "The Royal Power of Dissolution of Parliament".
Split into simpler sentences: While he had become a social radical, he remained a "Constitutional conservative", and wrote his PhD thesis on the King-Byng Affair, defending the positions of Arthur Meighen and Baron Byng. The thesis was published in 1943 as "The Royal Power of Dissolution of Parliament".