Complex sentence: The old Partagás Factory in Havana, since renamed the "Francisco Pérez Germán" factory, is still responsible for much of the annual production of the Partagás brand and has proven to be a very popular tourist destination for cigar smokers vacationing in Cuba.
Split into simpler sentences: The old Partagás Factory in Havana, since renamed "Francisco Pérez Germán", is still responsible for much of the annual production of the Partagás brand. It has proven a very popular tourist destination for cigar smokers vacationing in Cuba.