Complex sentence: During the Speed Bump in leg nine, Tanner and Josh both had to do the roadblock one after the other, marking the first time since the introduction of the Speed Bump wherein no Speed Bump boards exist throughout the race course.
Split into simpler sentences: During the Speed Bump in leg nine, Tanner and Josh both had to do the roadblock one after the other. This marked the first time since the introduction of the Speed Bump wherein no Speed Bump boards exist throughout the race course.