Complex sentence: Miłosz spent World War II in Warsaw, under Nazi Germany's "General Government", where, among other things, he attended underground lectures by Polish philosopher and historian of philosophy and aesthetics, Władysław Tatarkiewicz.
Split into simpler sentences: Miłosz spent World War II in Warsaw, under Nazi Germany's "General Government". Here he attended underground lectures by Polish philosopher and historian of philosophy and aesthetics, Władysław Tatarkiewicz.