Complex sentence: Fisher then boarded the SS "Scythia" from Le Havre, France, to Quebec, Canada; still using Kayotis' passport, he travelled to Montreal, Canada, and crossed into the United States on November 17.
Split into simpler sentences: Fisher then boarded the SS "Scythia" from Le Havre, France to Quebec, Canada. Fisher, having arrived in Quebec, then travelled to Montreal, Canada (still using Kayotis' passport) and crossed into the United States on November 17.