Complex sentence: On October 7,1869 the couple married just before the first yeast factory in the Netherlands, the "Nederlandsche Gist & Spiritusfabriek NV", which is now part of the multinational chemical company Koninklijke DSM, could start production.
Split into simpler sentences: On October 7,1869 the couple married just before the first yeast factory in the Netherlands opened. This was the "Nederlandsche Gist & Spiritusfabriek NV", which is now part of the multinational chemical company Koninklijke DSM, could start production.