Complex sentence: In 1906, he became Leader of the Opposition in the Senate and, when the Conservatives took power following the 1911 Canadian election he became Leader of the Government in the Senate and minister without portfolio in the government of Sir Robert Borden.
Split into simpler sentences: In 1906, he became Leader of the Opposition in the Senate. When the Conservatives took power following the 1911 election, he became Leader of the Government in the Senate and minister without portfolio in the government of Sir Robert Borden.