Complex sentence: In the 19th Century, the most important producer of tapestries in the world was the city of Aubusson, in France, it was there that Mr. Baumgarten found the Foussadier family who were taken to New York City to work in his company.
Split into simpler sentences: In the 19th Century, the most important producer of tapestries in the world was the city of Aubusson, in France. It was there that Mr. Baumgarten found the Foussadier family who were taken to New York City to work in his company.