Complex sentence: Nick and the others make it to Rhonda's auto shop and learn that the government is going to bomb the city in 6 days, and drive to a military checkpoint, only to find everyone there dead and are ambushed by a rogue biker gang.
Split into simpler sentences: Nick and the others make it to Rhonda's auto shop and learn that the government is going to bomb the city in six days. The group drives to a military checkpoint, only to find everyone there dead and be ambushed by a rogue biker gang.