Complex sentence: They come across a message inscribed in the sand, "BEWARE THE WHEELERS", and soon meet these gaudily-dressed, loudly-yelling creatures who have wheels instead of hands and feet, and roll around on all fours.
Split into simpler sentences: They come across a message inscribed in the sand: "BEWARE THE WHEELERS"! Soon the pair meets these gaudily-dressed, loudly-yelling creatures who have wheels instead of hands and feet, and roll around on all fours.