Complex sentence: In the final Roadblock, one team member to swim out to a floating tiki head, dive beneath the underwater to retrieve a rock from ocean floor, carry it back to the beach and they have to smash it open for the clue inside.
Split into simpler sentences: In the final Roadblock, one team member had to swim out to a floating tiki head, then dive beneath the underwater to retrieve a particular rock from ocean floor. They then carried it back to the beach where they had to smash it open for the clue inside.