Complex sentence: In 1937, it was expanded into a magazine that was sold exclusively in A&P stores for 5 cents (7 cents beginning in 1952), By 1944, circulation reached 3 million and increased to 4 million by 1958 when the magazine was sold to Fawcett Publications.
Split into simpler sentences: In 1937, it was expanded into a magazine that was sold exclusively in A&P stores for 5 cents. In 1944, circulation reached 3 million, reaching 4 million by 1958, when the magazine was sold to Fawcett Publications.