Complex sentence: The painting is in the National Gallery of Art in Washington, D.C., and Heade has been honored on a U.S. postage stamp Other of his works are in the White House and significant galleries.
Split into simpler sentences: The painting is in the National Gallery of Art in Washington, D.C., and Heade has been honored on a U.S. postage stamp. Others of his works are in the White House and significant galleries.