Complex sentence: Throughout the winter, Perlasca was active in hiding, shielding and feeding thousands of Jews in Budapest, and to issue them with safe conduct passes on the basis of a Spanish law passed in 1924 that grants citizenship to Jews of Sephardi origin.
Split into simpler sentences: Throughout the winter, Perlasca was active in hiding, shielding and feeding thousands of Jews in Budapest. He arranged for the ussuing of safe conduct passes on the basis of a Spanish law passed in 1924 that granted citizenship to Jews of Sephardi origin.