Margaret Thatcher, Lech Walesa, and Vaclav Havel all performed important supporting roles.
Margaret Thatcher, Lech Walesa and Vaclav Havel performed important roles in the film. 
mnli hypothesis: Margaret Thatcher, Lech Walesa and Vaclav Havel performed important roles in the film.  premise: Margaret Thatcher, Lech Walesa, and Vaclav Havel all performed important supporting roles.