After Germany invaded Poland in 1939, the Nazis outlawed teaching beyond elementary age. Dobrowolski, according to Polska Times, became a leader of a secret organization that kept trying to educate young Poles, especially about their country's culture and history.
Later in the war, the AP reports, Dobrowolski was "moved to the concentration camps of Gross-Rosen and Sachsenhausen. ... After the war, he moved to Debno, where he worked as a Polish-language teacher and as principal at an elementary school and later at a high school for many years."
As Reuters reminds us, "during Nazi Germany's World War II occupation of Poland, the Nazis killed some 1.5 million people in Auschwitz, located near the Polish village Oswiecim. Most of those killed were Jewish." Dobrowolski was not Jewish.
Correction Oct. 3, 2016
When Antoni Dobrowolski died, the Associated Press reported he was the oldest known survivor of the Auschwitz camp, and this post repeated that claim. In fact, Yisrael Kristal was born about a year before Dobrowolski. Kristal, also an Auschwitz survivor, is now 113.