Complex sentence: It was directed by F. A. Brabec based on 7 best-known, most epic and least explicitly Christian of Kytice, a collection of ballads by Karel Jaromír Erben; while relatively successful commercially, it was deplored by critics for its crude literalism of depiction.
Split into simpler sentences: It was directed by F. A. Brabec based on 7 best-known, most epic poems of "Kytice", a collection of ballads by Karel Jaromír Erben. While relatively successful commercially, it was deplored by critics for its crude literalism of depiction.