Complex sentence: Erich Heckel (1883-1970) was a German painter and print maker, and a founding member of the "Die Brücke" group ("The Bridge") which existed 1905-1913.
Split into simpler sentences: Erich Heckel (1883-1970) was a German painter and print maker. He was a founding member of the "Die Brücke" group ("The Bridge") which existed 1905-1913.