Complex sentence: Many new portraits of pregnant women or women posing as pregnant were created such as the Arnolfini portrait, as it is not sure is not sure whether the woman in the portrait was pregnant or not while posing for this painting.
Split into simpler sentences: Many new portraits of pregnant women or women posing to be pregnant were created. One of these portraits is the Arnolfini portrait, on which there is a dispute on whether the woman was pregnant or not while posing for this painting.