Complex sentence: Audio and Video transcripts show the aircraft being instructed to reduce speed 3 miles before entering the approach, and later show it did at least 5 miles into it, 4 miles behid the Mexicana Heavy aircraft ahead of it.
Split into simpler sentences: Audio and Video transcripts show the aircraft being instructed to reduce speed 3 miles before entering the approach, and later show it did at least 5 miles into it. By then, there were only 4 miles behid the Mexicana Heavy aircraft ahead of it.