Complex sentence: Research by both Kasper and Zanini De Vita indicates while ragù with pasta gained popularity through the 19th century, they were largely eaten by the wealthy, until the industrial revolution in the very late 19th century, made flour for pasta more affordable for the less affluent.
Split into simpler sentences: Research by both Kasper and Zanini De Vita indicates that, while ragù with pasta gained popularity through the 19th century, it was largely eaten by the wealthy. However, technological advances that came with the industrial revolution in the very late 19th century made flour for pasta more affordable for the less affluent.