Complex sentence: All of the feature-length movies Edward Everett Horton made from 1928 to 1929 with Warner Bros. are lost, except "Lights of New York" (1928), in which Horton was an extra in one scene.
Split into simpler sentences: All of the feature-length movies Edward Everett Horton made from 1928 to 1929 with Warner Brothers are lost, except "Lights of New York" (1928). In "Lights of New York," Horton was an extra in one scene.