Complex sentence: No one knows whether his family relates to the noble clan Korczak, as his given name suggests, but if so, his surname Ziółkowski was given this coat of arms in 1500, in Kraków, Poland.
Split into simpler sentences: No one knows whether Ziółkowski's family relates to the Polish noble clan Korczak, as his given name suggests. If there is a relationship, his surname, Ziółkowski, was given this coat-of-arms in 1500, in Kraków, Poland.