Complex sentence: In June 1937 he made a speech in Parliament, proposing the addition of a clause to the Factories Bill, "Prohibition of night work in bakehouses" which led to his being known as "the bakers' MP".
Split into simpler sentences: In June 1937 he made a speech in Parliament, proposing the addition of a clause to the Factories Bill, Prohibition of night work in bakehouses. This campaigning led to him being known as "the bakers' MP".