So here,
Sam, Sally and John are on the boat and are sailing to find a island.Suddenly the motor stops working. They all were worried. Sally started crying because the boat was not moving. After that they see a mountain. And decides to Swim till there.
Answer:
compound sentence :)
Explanation:
it contains two clauses. the main and the subordinate. a main clause can make sense on it's own, a subordinate can not.