Complex sentence: The association was formed in 1941by a small group of greeting card publishers under the leadership of George Burkhardt of Burkhardt-Warner in response to a War Department order during World War II to reduce paper use by 25%.
Split into simpler sentences: The Association was formed in 1941, initially organized from a small group of greeting card publishers under the leadership of George Burkhardt of Burkhardt-Warner. The formation of the organization was a response to a War Department order during World War II to reduce paper use by 25%.