Complex sentence: Richard Ernst Artschwager (December 26,1923--February 9,2013) was an American painter, illustrator and sculptor, best known for his stylistic independence; however, he had associations with the Pop Art movement, Conceptual art and Minimalism.
Split into simpler sentences: Richard Ernst Artschwager (December 26,1923--February 9,2013) was an American painter, illustrator and sculptor. While known for stylistic independence he nevertheless had associations with the Pop Art movement, Conceptual art and Minimalism.