Complex sentence: During the period, she created a total of 67 covers for "Weird Tales"; and she contributed an occasional piece throughout the 1940s; her last cover for the magazine appeared in 1953.
Split into simpler sentences: During the period, she created a total of 67 covers for "Weird Tales". Brundage still continued to contribute occasional pieces throughout the 1940s; her last cover for the magazine appeared in 1953.