Complex sentence: After the war he was on familiar terms with Jean-Paul Riopelle and the Canadian Automatistes, as well as Diego Rivera and Rufino Tamayo in Mexico City, hence his artistic roots lay well outside the scope of any one movement or national school.
Split into simpler sentences: After the war he was on familiar terms with Jean-Paul Riopelle and the Canadian Automatistes, as well as Diego Rivera and Rufino Tamayo in Mexico City. His artistic roots lay well outside the scope of any one movement or national school.