Complex sentence: Entitled "Escape from Mars", the story would have been largely much the same; however, after "Escape from L.A." failed to make much money at the box office, the studio did not wish to make another Plissken movie.
Split into simpler sentences: Entitled "Escape from Mars", the story would have been largely much the same. However, after "Escape from L.A." failed to make much money at the box office the studio did not wish to make another Plissken movie.