Complex sentence: The Kunstsammlung Nordrhein-Westfalen started in 1960 with the purchase of 88 works by Paul Klee financed by the foundation "Stiftung Kunstsammlung Nordrhein-Westfalen".
Split into simpler sentences: The Kunstsammlung Nordrhein-Westfalen started in 1960 by buying 88 works of Paul Klee. So the collection started as foundation "Stiftung Kunstsammlung Nordrhein-Westfalen".