Complex sentence: There are, in fact, 12 separate and unrelated families with this surname; the result of there having been a number of village estates named Jankowa or Jankowice in the Kingdom of Poland during the 14th century.
Split into simpler sentences: There are, in fact, 12 separate and unrelated families with this surname. This is the result of there having been a number of village estates named Jankowa or Jankowice in the Kingdom of Poland during the 14th century.