Complex sentence: In 1907 he accepted a position with the Otis Lithograph Company of Cleveland, Ohio and in 1911 he co-founded the Kokoon Arts Club to promote modern art in Cleveland.
Split into simpler sentences: In 1907 he accepted a position with the Otis Lithograph Company of Cleveland, Ohio. In 1911 he co-founded the Kokoon Arts Club to promote modern art in Cleveland.