Complex sentence: The Germans made considerable use of the weapon ("Flammenwerfer" 35) during their invasion of western Europe, especially in Holland and France, against fixed fortifications, but it soon fell into disfavor, except in reprisal operations.
Split into simpler sentences: The Germans made considerable use of the weapon ("Flammenwerfer" 35) during their invasion of western Europe, especially in Holland and France, against fixed fortifications. However, flemathrowers soon fell into disfavor, except in reprisal operations.