Complex sentence: The film is in the Weimar tradition of Street films, which examined the lower-depths of society, and has become the film for which Mittler is best known, even though he had only been appointed to make it after another director had to withdraw.
Split into simpler sentences: The film is in the Weimar tradition of Street films, which examined the lower-depths of society. It has become the film for which Mittler is best known, even though he had only been appointed to make it after another director had to withdraw.