Complex sentence: In the same period, rabbits were introduced from the Iberia across the Alps to the Carolingian Empire and reached England the twelfth century, herring could be more effectively salted, and pork, cheese, and eggs increasingly consumed throughout Europe, even by the lower classes.
Split into simpler sentences: In the same period, rbbits were introduced from the Iberian Peninsula across the Alps to the Carolingian Empire and reached England in the 12th century. Herring could be more effectively salted, and pork, cheese, and eggs were increasingly consumed throughout Europe, even by the lower classes.