Complex sentence: Roblin played a crucial role in the 1911 federal election on reciprocity by putting his electoral machine at the disposal of the federal Conservatives, helping to defeat Sir Wilfrid Laurier and put Robert Borden in power.
Split into simpler sentences: Roblin played a crucial role in the 1911 federal election on reciprocity by putting his electoral machine at the disposal of the federal Conservative Party. In so doing, Roblin helped to defeat Sir Wilfrid Laurier and put Robert Borden in power.