Complex sentence: MacInnis, a trade unionist, was first elected to the Canadian House of Commons in the 1930 Canadian election as an Independent Labour MP for Vancouver and joined the Ginger Group of socialist MPs led by J.S. Woodsworth.
Split into simpler sentences: MacInnis, a trade unionist, was first elected to the Canadian House of Commons in the 1930 election as an Independent Labour Member of Parliament (MP) for Vancouver. He joined the Ginger Group of socialist MPs led by J.S. Woodsworth.