old_contents: def humanise_passage(book, start_chapter, start_verse, end_chapter, end_verse):
      same_chapter = start_verse == end_chapter
      return "{book} {chapter} {rest}".format(
          book=book, chapter=start_chapter, rest=(
              "verse {start_verse}".format(start_verse=start_verse)
              if same_chapter and start_verse == end_verse
              else (
                  "verses {start_verse} to {end_verse}".format(start_verse=start_verse,
                                                               end_verse=end_verse)
                  if same_chapter
                  else "verse {start_verse} to chapter {end_chapter} verse {end_verse}".format(
                      start_verse=start_verse, end_chapter=end_chapter, end_verse=end_verse)
              )
          )
      )
  
new_contents: def humanise_passage(book, start_chapter, start_verse, end_chapter, end_verse):
      same_chapter = start_chapter == end_chapter
      return "{book} chapter {chapter} {rest}".format(
          book=book, chapter=start_chapter, rest=(
              "verse {start_verse}".format(start_verse=start_verse)
              if same_chapter and start_verse == end_verse
              else (
                  "verses {start_verse} to {end_verse}".format(start_verse=start_verse,
                                                               end_verse=end_verse)
                  if same_chapter
                  else "verse {start_verse} to chapter {end_chapter} verse {end_verse}".format(
                      start_verse=start_verse, end_chapter=end_chapter, end_verse=end_verse)
              )
          )
      )
  
subject: correct humanise passage method