Complex sentence: Italy is the largest producer and consumer of this plant, where its common names include Barba di Frate, Agretti roscana or Liscari sativa; the latter two names appear to have been created and popularised by seed manufacturers.
Split into simpler sentences: Italy is the largest producer and consumer of this plant. Its most common names are Italian in origin; the names "Agretti roscana" and "Liscari sativa" appear to have been created and popularised by seed manufacturers.