Complex sentence: By 1939, "Winnie Winkle" was running in more than 140 newspapers, and by 1970, it still ran in more than 150 newspapers.
Split into simpler sentences: By 1939, "Winnie Winkle" was running in more than 140 newspapers. By 1970, "Winnie Winkle" still ran in more than 150 newspapers.