Complex sentence: The film is a remake of "The Student of Prague" (1913), and is considered as Galeen's most important film since "The Golem" (1915) and is regarded as his magnum opus.
Split into simpler sentences: The film is a remake of "The Student of Prague" (1913). It is considered as Galeen's most important film since "The Golem" (1915) and is regarded as his magnum opus.