Line length and line count
42 characters and two lines, as a starting rule.
A line longer than about 42 characters is hard to read in a phone-width caption. Two lines is the usual maximum. The sample’s first cue is 81 characters on one line, so it fails both the length rule and, if you also count it as one long line, the “will anyone finish it” test.
Break the thought at a phrase, not at an arbitrary word in the middle of a name. The checker does not rewrite your wording. It only measures.
Change the character and line limits on checker if a house style differs. Write the style down next to the export so the next edit uses the same numbers.