['they', 'embark', 'prevent', 'attempt', 'on']
['<PRP>', 'embark', 'forbid-64.4', "Synset('act.n.02')", 'on']
They are embarked on an attempt to change history, preventing Voyager's destruction from ever occurring.
<PRP> are embarked on an Synset('act.n.02') to change history, preventing Voyager's Synset('happening.n.01') from ever occurring.