Well, 'broken trail based true story' can be significant as it likely brings to light the truth about a journey or a path that has been disrupted or broken in some way. Maybe it's about a group of people or an individual who had to face unexpected obstacles and how they overcame them, making it an inspiring true story.
One example could be the story of a group of settlers who were trying to follow an old trade route (a trail) but found that parts of it had been washed away by floods. They had to find new ways to reach their destination, facing shortages of supplies and attacks from wild animals along the way. This would be a true story based on a broken trail.
The AMC miniseries Broken Trail is not based on real events. It's a work of fiction that combines elements of drama and adventure to captivate the audience.