Complex sentence: The Lewis and Clark Expedition was celebrated on May 14,2004, the 200th anniversary of its outset, by depicting the two on a hilltop outlook: two companion 37-cent USPS stamps showed portraits of Meriwether Lewis and William Clark.
Split into simpler sentences: The Lewis and Clark expedition was celebrated on May 14,2004, the 200th anniversary of its outset depicting the two on a hilltop outlook. Two companion 37-cent stamps showed portraits of Meriwether Lewis and William Clark.