Complex sentence: Harry Alan Towers commissioned the original script that used the novel's original ending (in which Lombard gets shot and Vera hangs herself) and setting the action on an island, however, both of these were changed at the last minute.
Split into simpler sentences: Harry Alan Towers commissioned the original script that used the novel's ending (in which Lombard gets shot and Vera hangs herself) and setting the action on an island. However, both of these were changed at the last minute.