I watched this at home on BluRay from my public library. My wife skipped, she doesn't like to see movies with subtitles.
I studied German for two years in college, while I can't converse in it anymore I was able to fit the German dialog with the English subtitles.
While there are several intersecting stories the main thread is Kurt, a boy of 8 in 1937 Nazi Germany, being exposed to various forms of art by his 20-something aunt. As he grows, and WW2 comes and goes, he develops into a quite good painter. He eventually has to escape to West Berlin to be free to develop his talents. The story extends through the 1960s.
Part of the overlapping story is of the Nazi programs to purify their race, to see to it that even Germans who had some sort of affliction were terminated, and this was the fate of his aunt who had the occasional emotional malfunction. As it turns out Kurt unwittingly marries the daughter of one of the evil doctors who it seems had named his daughter Elizabeth, the same as Kurt's aunt.
This is a really good movie and at just over 3 hours didn't seem overly long, I can't think of any scene that I would cut. However I watched it over three different sessions with some overlap each time. In the extra on the disc the writer/director explains, in English, how he modeled his story off a real German artist who developed through this same period.