Complex sentence: Their last-place finish was on the sixth leg of the race, a non-elimination leg, meaning they need to face a "Speed Bump" task on the seventh leg--completion of a slide puzzle that revealed the Malawi national flag.
Split into simpler sentences: Their last-place finish was on the sixth leg of the race, a non-elimination leg. They had to face a "Speed Bump" task on the seventh leg--completion of a slide puzzle that revealed the Malawi national flag.